求24点数学题目和解决方法，不下于20条，明天中午之前回答，按回答程度加悬赏。 求几道数学题，要具体过程，初一水平，因式分解。尽量全部都回答...
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A\u7684\u9876\u7aefP\u5904. \u7ec6\u7ebf\u7684\u53e6\u4e00\u7aef\u62f4\u4e00\u8d28\u91cf\u4e3am\u7684\u5c0f\u7403\uff0c\u5f53
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\u7684\u538b\u529b\u7b49\u4e8e\u96f6\uff0c\u5f53\u6ed1\u5757\u4ee5a=2g\u7684\u52a0\u901f\u5ea6\u5411\u5de6\u8fd0\u52a8\u65f6\uff0c\u7ebf\u4e2d\u62c9\u529bT\u4e3a\u591a\u5c11\uff1f
\u5e73\u629b\u7c7b\uff1a
25\uff0e\u5982\u56fe\uff0c\u5c06\u7269\u4f53\u4ee510 m/s\u7684\u6c34\u5e73\u901f\u5ea6\u629b\u51fa,\u7269\u4f53\u98de\u884c\u4e00\u6bb5\u65f6\u95f4\u540e,\u5782\u76f4\u649e\u4e0a\u503e\u89d2\u03b8=30\u00b0\u7684\u659c\u9762\uff0c\u5219\u7269\u4f53\u5728\u7a7a\u4e2d\u7684\u98de\u884c\u65f6\u95f4\u4e3a\u591a\u5c11\uff1f\uff08g=10 m/s2\uff09.
26\uff0e\u5982\u56fe\u6240\u793a\uff0c\u4ece\u503e\u89d2\u4e3a\u03b8\u7684\u659c\u9762\u9876\u70b9A\u5c06\u4e00\u5c0f\u7403\u4ee5v0\u521d\u901f\u6c34\u5e73\u629b\u51fa\uff0c\u5c0f\u7403\u843d\u5728\u659c\u9762\u4e0aB\u70b9\uff0c\u6c42\uff1a\uff081\uff09AB\u7684\u957f\u5ea6\uff1f\uff082\uff09\u5c0f\u7403\u843d\u5728B\u70b9\u65f6\u7684\u901f\u5ea6\u4e3a\u591a\u5c11\uff1f
\u7ad6\u76f4\u9762\u7684
\u7c7b\uff1a
27. \u8f7b\u6746\u957f \uff0c\u6746\u7684\u4e00\u7aef\u56fa\u5b9a\u7740\u8d28\u91cf \u7684\u5c0f\u7403\u3002\u5c0f\u7403\u5728\u6746\u7684\u5e26\u52a8\u4e0b\uff0c\u7ed5\u6c34\u5e73\u8f74O\u5728\u7ad6\u76f4\u5e73\u9762\u5185\u4f5c
\uff0c\u5c0f\u7403\u8fd0\u52a8\u5230\u6700\u9ad8\u70b9C\u65f6\u901f\u5ea6\u4e3a2 \u3002 \u3002\u5219\u6b64\u65f6\u5c0f\u7403\u5bf9\u7ec6\u6746\u7684\u4f5c\u7528\u529b\u5927\u5c0f\u4e3a\u591a\u5c11\uff1f\u65b9\u5411\u5462\uff1f
28. \u5c0f\u7403\u7684\u8d28\u91cf\u4e3am\uff0c\u5728\u7ad6\u76f4\u653e\u7f6e\u7684\u5149\u6ed1\u5706\u73af\u8f68\u9053\u7684\u9876\u7aef\uff0c\u5177\u6709\u6c34\u5e73\u901f\u5ea6V\u65f6\uff0c\u5c0f\u7403\u6070\u80fd\u901a\u8fc7\u5706\u73af\u9876\u7aef\uff0c\u5982\u56fe\u6240\u793a\uff0c\u73b0\u5c06\u5c0f\u7403\u5728\u9876\u7aef\u901f\u5ea6\u52a0\u5927\u52302V\uff0c\u5219\u5c0f\u7403\u8fd0\u52a8\u5230\u5706\u73af\u9876\u7aef\u65f6\uff0c\u5bf9\u5706\u73af\u538b\u529b\u7684\u5927\u5c0f\u4e3a\u591a\u5c11
29\uff0e\u5f53\u6c7d\u8f66\u901a\u8fc7
\u9876\u70b9\u7684\u901f\u5ea6\u4e3a10 \u65f6\uff0c\u8f66\u5bf9\u6865\u9876\u7684\u538b\u529b\u4e3a\u8f66\u91cd\u7684 \uff0c\u5982\u679c\u8981\u4f7f\u6c7d\u8f66\u5728\u7c97\u7cd9\u7684\u6865\u9762\u884c\u9a76\u81f3\u6865\u9876\u65f6\uff0c\u4e0d\u53d7\u6469\u64e6\u529b\u4f5c\u7528\uff0c\u5219\u6c7d\u8f66\u901a\u8fc7\u6865\u9876\u7684\u901f\u5ea6\u4e3a\u591a\u5927\uff1f
\u591a\u89e3\u95ee\u9898\uff1a
30\uff0e\u53f3\u56fe\u6240\u793a\u4e3a\u8fd1\u4f3c\u6d4b\u91cf\u5b50\u5f39\u901f\u5ea6\u7684\u88c5\u7f6e\uff0c\u4e00\u6839\u6c34\u5e73
\u7684\u7aef\u90e8\u710a\u63a5\u4e00\u4e2a\u534a\u5f84\u4e3aR\u7684\u843d\u58c1\u5706\u7b52\uff08\u56fe\u4e3a
\uff09
\u7684\u8f6c\u901f\u662f\u6bcf\u5206\u949fn\u8f6c\uff0c\u4e00\u9897\u5b50\u5f39\u6cbf\u5706\u7b52\u7684\u6c34\u5e73\u76f4\u5f84\u7531A\u70b9\u5c04\u5165\u5706\u7b52\uff0c\u4eceB\u70b9\u7a7f\u51fa\uff0c\u5047\u8bbe\u5b50\u5f39\u7a7f\u58c1\u65f6\u901f\u5ea6\u5927\u5c0f\u4e0d\u53d8\uff0c\u5e76\u4e14\u98de\u884c\u4e2d\u4fdd\u6301\u6c34\u5e73\u65b9\u5411\uff0c\u6d4b\u91cf\u51faA\u3001B\u4e24\u70b9\u95f4\u7684\u5f27\u957f\u4e3aL\uff0c\u5199\u51fa\uff1a\u5b50\u5f39\u901f\u5ea6\u7684\u8868\u8fbe\u5f0f\u3002
31\u3001\u5982\u53f3\u56fe\u6240\u793a\uff0c\u534a\u5f84\u4e3aR\u7684\u5706\u76d8\u4f5c\u5300\u901f\u8f6c\u52a8\uff0c\u5f53\u534a\u5f84OA\u8f6c\u5230\u6b63\u4e1c\u65b9\u5411\u65f6\uff0c\u9ad8h\u7684\u4e2d\u5fc3\u7acb\u6746\u9876\u7aef\u7684\u5c0f\u7403B\uff0c\u4ee5\u67d0\u4e00\u521d\u901f\u5ea6\u6c34\u5e73\u5411\u4e1c\u5f39\u51fa\uff0c\u8981\u6c42\u5c0f\u7403\u7684\u843d\u70b9\u4e3aA\uff0c\u6c42\u5c0f\u7403\u7684\u521d\u901f\u5ea6\u548c\u5706\u76d8\u65cb\u8f6c\u7684
\u3002
\u4f20\u9001\u7c7b\uff1a
32\u3001\u4e00\u5e73\u76f4
\u4ee52m/s\u7684\u901f\u7387\u5300\u901f\u8fd0\u884c\uff0c
\u628aA\u5904\u7684\u767d\u7c89\u5757\u9001\u5230B\u5904\uff0cAB\u95f4\u8ddd\u79bb10\u7c73\uff0c\u5982\u679c\u7c89\u5757\u4e0e
\u03bc\u4e3a0.5\uff0c\u5219\uff1a\uff081\uff09\u7c89\u5757\u4eceA\u5230B\u7684\u65f6\u95f4\u662f\u591a\u5c11\uff1f\uff082\uff09\u7c89\u5757\u5728\u76ae\u5e26\u4e0a\u7559\u4e0b\u7684\u767d\u8272\u64e6\u75d5\u957f\u5ea6\u4e3a\u591a\u5c11\uff1f\uff083\uff09\u8981\u8ba9\u7c89\u5757\u80fd\u5728\u6700\u77ed\u65f6\u95f4\u5185\u4eceA\u5230B\uff0c\u4f20\u9001\u5e26\u7684\u901f\u7387\u5e94\u591a\u5c11\uff1f
\u9ad8\u4e00\u7269\u7406\u8ba1\u7b97\u9898\u57fa\u672c\u7c7b\u578b\uff08\u89e3\u7b54\uff09
1\uff0e(1)\uff08m1+m2\uff09g/k1+m2g/k2 (2)m2g+k2m1g/(k1+k2) \u89e3\u7b54\uff1a(1)\u5bf9m2
\uff0cm2g=k2x2\u5bf9m1\u5206\u6790\uff1a(m1+m2)g=k1x1 \u603b\u4f38\u957fx=x1+x2\u5373\u53ef(2)\u603b\u957f\u4e3a\u539f\u957f\uff0c\u5219\u4e0b\u5f39\u7c27\u538b\u7f29\u91cf\u5fc5\u4e0e\u4e0a\u5f39\u7c27\u4f38\u957f\u91cf\u76f8\u7b49\uff0c\u5373x1\uff1dx2 \u5bf9m2
F= k2x2+m2g \u5bf9m1\u5206\u6790\uff1ak2x2+k1x1=m1g\uff0c\u89e3\u5f97F
2\uff0e12.5m 3. a2s/(a1+a2)
4. 80m,4s (\u8bbe\u4e0b\u843d\u65f6\u95f4\u4e3at,\u5219\u6709:\u6700\u540e1s\u5185\u7684\u4f4d\u79fb\u4fbf\u662fts\u5185\u7684\u4f4d\u79fb\u4e0e(t-1)S\u5185\u4f4d\u79fb\u4e4b\u5dee:
\u4ee3\u5165\u6570\u636e,\u5f97t=4s,\u4e0b\u843d\u65f6\u7684\u9ad8\u5ea6 )
5. (\u6746\u8fc7P\u70b9,A\u70b9\u4e0b\u843dh+L\u65f6,\u6746\u5b8c\u5168\u8fc7P\u70b9\u4eceA\u70b9\u5f00\u59cb\u4e0b\u843d\u81f3\u6746\u5168\u90e8\u901a\u8fc7P\u70b9\u6240\u7528\u65f6\u95f4 ,B\u70b9\u4e0b\u843dh\u6240\u7528\u65f6\u95f4, ,\u2234\u6746\u8fc7P\u70b9\u65f6\u95f4t=t1-t2
6. ( A\u3001B\u90fd\u505a\u7684
\u8981\u540c\u65f6\u5230\u8fbe\u5730\u9762,B\u53ea\u53ef\u80fd\u5728A\u7684\u4e0b\u65b9\u5f00\u59cb\u8fd0\u52a8,\u5373B\u4e0b\u843d\u9ad8\u5ea6\u4e3a(H-n),H\u4e3a\u5854\u7684\u9ad8\u5ea6,\u6240\u4ee5 \u2026\u2460, \u2026\u2461, \u2026\u2462,\u8054\u7acb\u2460\u3001\u2461\u3001\u2462\u5f0f\u5373\u6c42\u51fa )
7. 0.5s,35m(\u8bbe\u95f4\u9694\u65f6\u95f4\u4e3at,\u4f4d\u79fb\u7b2c11\u4e2a\u5230\u7b2c10\u4e2a\u4e3as1,\u7b2c11\u4e2a\u5230\u7b2c9\u4e2a\u4e3as2,\u2026,\u4ee5\u6b64\u7c7b\u63a8,\u7b2c11\u4e2a\u5230\u7b2c1\u4e2a\u4e3as10\u3002\u56e0\u4e3a\u90fd\u505a
,\u6240\u4ee5 , , , \u6240\u4ee5\u7b2c3\u4e2a\u7403\u4e0e\u7b2c5\u4e2a\u7403\u95f4\u8ddd\u0394s=s8-s6=35m)
8.(1)4s 16m (2)4s 4m 9. 12m/s 10. 25m
11. 2.75s(\u70b9\u62e8:\u5bf9B\u800c\u8a00,\u505a\u51cf\u901f\u8fd0\u52a8\u5219\u7531,vt=v0+at\u5f97:tB=2s,\u6240\u4ee5B\u8fd0\u52a82s\u540e\u5c31\u9759\u6b62\u4e86. \u5f97sB=4m.\u53c8\u56e0\u4e3aA\u3001B\u76f8\u71677m,\u6240\u4ee5A\u8ffd\u4e0aB\u5171\u8d70\u4e86sA=7m+4m=11m,\u7531s=vt\u5f97 )
12.\u89e3\uff1a\u7269\u4f53\u53d7\u529b\u60c5\u51b5\u5982\u56fe\u6240\u793a\uff0c\u5219\u6709
Fcos\u03b8=f=\u03bcN; \u4e14N=mg+Fsin\u03b8; \u8054\u7acb\u89e3\u5f97F=\u03bcmg/(cos\u03b8-\u03bcsin\u03b8);
f=Fcos\u03b8=\u03bcmg cos\u03b8/(cos\u03b8-\u03bcsin\u03b8)
13.\u5982\u53f3\u56fe\u6240\u793a\uff1a\u7531\u5e73\u8861\u6761\u4ef6\u5f97?2Tsin\u03b8=mg?\u8bbe\u5de6\u3001\u53f3\u4e24\u4fa7\u7ef3\u957f\u5206\u522b\u4e3al1\u3001l2\uff0cAO=l\uff0c\u5219\u7531\u51e0\u4f55\u5173\u7cfb\u5f97?l1cos\u03b8+l2cos\u03b8=l?
l1+l2=2l?\u7531\u4ee5\u4e0a\u51e0\u5f0f\u89e3\u5f97\u03b8=60\u00b0?T= mg?
14. 0.56kg\u2264m\u22641.84kg
f\uff1dmAa F-\u03bc\uff08mA+mB\uff09g=\uff08mA+mB\uff09a \u6216\u03bc(mA+mB\uff09g - F=\uff08mA+mB\uff09a
15.\u89e3\uff1a\u7269\u4f53\u4f4d\u4e8eQ\u70b9\u65f6\uff0c\u5f39\u7c27\u5fc5\u5904\u4e8e\u538b\u7f29\u72b6\u6001\uff0c\u5bf9\u7269\u4f53\u7684\u5f39\u529bFQ\u6cbf\u659c\u9762\u5411\u4e0b\uff1b\u7269\u4f53\u4f4d\u4e8eP\u70b9\u65f6\uff0c\u5f39\u7c27\u5df2\u5904\u4e8e\u62c9\u4f38\u72b6\u6001\uff0c\u5bf9\u7269\u4f53\u7684\u5f39\u529bFP\u6cbf\u659c\u9762\u5411\u4e0a\uff0cP\u3001Q\u4e24\u70b9\u662f\u7269\u4f53\u9759\u6b62\u4e8e\u659c\u9762\u4e0a\u7684\u4e34\u754c\u4f4d\u7f6e\uff0c\u6b64\u65f6\u659c\u9762\u5bf9\u7269\u4f53\u7684
\u90fd\u8fbe\u5230\u6700\u5927\u503cFm\uff0c\u5176\u65b9\u5411\u5206\u522b\u6cbf\u659c\u9762\u5411\u4e0b\u548c\u5411\u4e0a.\u6839\u636e
\u548c\u7269\u4f53\u7684\u5e73\u8861\u6761\u4ef6\u5f97\uff1ak\uff08l0\uff0dl1\uff09+mgsin\u03b1=Fm k\uff08l2\uff0dl0\uff09=mgsin\u03b1+Fm? \u89e3\u5f97Fm= k\uff08l2-l1\uff09= \u00d7100\u00d70.14 N=7 N?
16.\u89e3\uff1a\u70ed\u6c14\u7403\u5300\u901f\u4e0b\u964d\u65f6\uff0c\u5b83\u53d7\u7684\u4e3e\u529bF\u4e0e\u91cd\u529bMg\u5e73\u8861.\u5f53\u4ece\u70ed\u6c14\u7403\u4e2d\u91ca\u653e\u4e86\u8d28\u91cf\u4e3am\u7684\u6c99\u888b\u540e\uff0c\u70ed\u6c14\u7403\u53d7\u5230\u7684
\u5927\u5c0f\u662fmg\uff0c\u65b9\u5411\u5411\u4e0a.\u70ed\u6c14\u7403\u505a\u521d\u901f\u5ea6\u4e3av\u3001\u65b9\u5411\u5411\u4e0b\u7684\u5300\u51cf\u901f\u8fd0\u52a8\uff0c\u52a0\u901f\u5ea6\u7531mg\uff1d\uff08M-m\uff09a\uff0c\u5f97a\uff1d .\u7531v-at\uff1d0 \u5f97\u70ed\u6c14\u7403\u505c\u6b62\u4e0b\u964d\u65f6\u5386\u65f6t\uff1d .\u6c99\u888b\u91ca\u653e\u540e\uff0c\u4ee5\u521d\u901fv\u505a\u7ad6\u76f4\u4e0b\u629b\u8fd0\u52a8\uff0c\u8bbe\u5f53\u70ed\u6c14\u7403\u901f\u5ea6\u4e3a0\u65f6\uff0c\u6c99\u888b\u901f\u5ea6\u4e3avt.\u5219vt\uff1dv\uff0bgt\uff0c\u5c06t\u4ee3\u5165\u5f97vt\uff1d v.
17\uff0e\uff081\uff09100 N.\u5782\u76f4\u659c\u9762\u5411\u4e0b\uff082\uff0950 N .\u6c34\u5e73\u5411\u5de6 18.0.58m/s2
19.\uff081\uff0916.8m\uff082\uff0911.0m/s\uff083\uff095.1s\u89e3\u7b54\uff1a(1)\u4e0a\u6ed1a1=gsin370+\u03bcgcos370=8.4m/s2 S=v2/2a1=16.8m
(2)\u4e0b\u6ed1 a2=gsin370-\u03bcgcos370=8.4m/s2 v22=2a2S v2=11.0m/s(3)t1=v1/a1=2s t2=v2/a2=3.1s
20.\u89e3\uff1a\u56e0A\u3001B\u4e00\u8d77\u52a0\u901f\u8fd0\u52a8\uff0c\u6574\u4f53\u7531\u725b\u987f\u7b2c\u4e8c\u5b9a\u5f8b\u6709F-\u03bcmg\uff1d3ma\uff0ca\uff1d .
\u9694\u79bbB\uff0c\u6c34\u5e73\u65b9\u5411\u4e0a\u53d7\u6469\u64e6\u529bFf\uff1d\u03bcmg\uff0cA\u5bf9B\u7684\u4f5c\u7528\u529bT\uff0c\u7531\u725b\u987f\u7b2c\u4e8c\u5b9a\u5f8b\u6709
T-\u03bcmg\uff1dma\uff0c\u6240\u4ee5T\uff1d\u03bcmg\uff0b
21. 2/5F (\u6574\u4f53F=5ma \u9694\u79bb4\u30015\u7269\u4f53N=2ma=2F/5)
22\uff0e2.5 m/s2.\u7ad6\u76f4\u5411\u4e0b 23\uff0e150N\uff1cF\u2264180N 24\uff0eg; mg 25\uff0e
26\uff0e\u89e3\uff1a\uff081\uff09\u8bbeAB=L\uff0c\u5c06\u5c0f\u7403\u8fd0\u52a8\u7684\u4f4d\u79fb\u5206\u89e3\uff0c\u5982\u56fe\u6240\u793a.
\u7531\u56fe\u5f97\uff1aLcos\u03b8=v0t v0ttan\u03b8= gt2 \u89e3\u5f97\uff1at= L= \uff082\uff09B\u70b9\u901f\u5ea6\u5206\u89e3\u5982\u53f3\u56fe\u6240\u793a.vy=gt=2v0tan\u03b8 \u6240\u4ee5vB= =v0
tan\u03b1=2tan\u03b8\uff0c\u5373\u65b9\u5411\u4e0ev0\u6210\u89d2\u03b1=arctan2tan\u03b8.
27\uff0e0.2N \u5411\u4e0b (\u5f53mg=mv2/L, v\u22482.24m/s>2m/s,\u6240\u4ee5\u6746\u5bf9\u5c0f\u7403\u7684\u662f\u652f\u6301\u529b\uff0c\u2234mg-N=mv2/L N=0.2N,\u6839\u636e\u725b\u4e09\u5b9a\u5f8b\uff0c\u7403\u5bf9\u6746\u4f5c\u7528\u529b\u4e3aF\uff1d0.2N,\u65b9\u5411\u5411\u4e0b
28\u30013mg 29\u300120m/s
30. n\u03c0R2/15(2k\u03c0R+\u03c0R-L)
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32.(1)5.2s (2)0.4m (3) 10m/s (1)a=\u03bcg v=at1 t1=0.4s S1=v2/2a=0.4m t2=SAB/v=4.8s
(2)\u7c89\u5757\u505c\u6b62\u6ed1\u52a8\u65f6\u76ae\u5e26\u4f4d\u79fbS2=vt1=0.8m S=S2-S1=0.4m (3)\u7c89\u5757A\u8fd0\u52a8\u5230B\u65f6\u4e00\u76f4\u5904\u4e8e\u52a0\u901f\u72b6\u6001\uff0c\u7528\u65f6\u6700\u77ed V2=2aSAB v=10m/s
1.\u8e66\u7ea7\u662f\u4e00\u79cd\u6781\u9650
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A.\u5f39\u6027\u7ef3\u62c9\u5c55\u524d\u8fd0\u52a8\u5458\u5904\u4e8e
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B.\u5f39\u6027\u7ef3\u62c9\u5c55\u540e\u8fd0\u52a8\u5458\u5148\u5904\u4e8e
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D.\u8fd0\u52a8\u5458\u4e00\u76f4\u5904\u4e8e\u5931\u91cd\u72b6\u6001
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A. 25m/s\uff0c1.25 B. 40m/s\uff0c0.25 C. 50m/s\uff0c0.25 D. 80m/s\uff0c1.25
4\uff0e\u5728\u5149\u6ed1\u6c34\u5e73\u9762\u4e0a\uff0c\u6709\u4e00\u4e2a\u7269\u4f53\u540c\u65f6\u53d7\u5230\u4e24\u4e2a\u6c34\u5e73\u529bF1\u4e0eF2\u7684\u4f5c\u7528\uff0c\u5728\u7b2c1s\u5185\u7269\u4f53\u4fdd\u6301\u9759\u6b62\u72b6\u6001\u3002\u82e5\u4e24\u529bF1\u3001F2\u968f\u65f6\u95f4\u7684\u53d8\u5316\u5982\u56fe\u6240\u793a\u3002\u5219\u4e0b\u8ff0\u8bf4\u6cd5\u4e2d\u6b63\u786e\u7684\u662f\uff08 \uff09
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B\u3001\u7269\u4f53\u5728\u7b2c3s\u5185\u505a\u52a0\u901f\u8fd0\u52a8\uff0c\u52a0\u901f\u5ea6\u5927\u5c0f\u9010\u6e10\u51cf\u5c0f\uff0c\u901f\u5ea6\u9010\u6e10\u589e\u5927
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C\u3001A\u3001B\u4e4b\u95f4\u7684\u6469\u64e6\u529b\u4e3a\u96f6
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A\uff0e0 B\uff0e3N C\uff0e25N D\uff0e30N
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A\u3001
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A\u3001
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B\u3001
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A\uff0ea\u5bf9c\u7684\u6469\u64e6\u529b\u65b9\u5411\u5411\u53f3
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A\u3001\u5411\u4e0a\uff0cMg/m B\u3001\u5411\u4e0a\uff0cg
C\u3001\u5411\u4e0b\uff0cg D\u3001\u5411\u4e0b\uff0c(M\u5341m)g/m
12\uff0e\u5982\u56fe\u6240\u793a\uff0c\u8d28\u91cf\u4e3a10kg\u7684\u7269\u4f53A\u62f4\u5728\u4e00\u4e2a\u88ab\u6c34\u5e73\u62c9\u4f38\u7684\u5f39\u7c27\u4e00\u7aef\uff0c\u5f39\u7c27\u7684\u62c9\u529b\u4e3a5N\u65f6\uff0c\u7269\u4f53A \u5904\u4e8e\u9759\u6b62\u72b6\u6001\uff0c\u82e5\u5c0f\u8f66\u4ee51m/s2\u7684\u52a0\u901f\u5ea6\u5411\u53f3\u8fd0\u52a8\u540e\uff0c\u5219\uff08g=10m/s2\uff09\uff08 \uff09
A\uff0e\u7269\u4f53A\u76f8\u5bf9\u5c0f\u8f66\u4ecd\u7136\u9759\u6b62
B\uff0e\u7269\u4f53A\u53d7\u5230\u7684\u6469\u64e6\u529b\u51cf\u5c0f
C\uff0e\u7269\u4f53A\u53d7\u5230\u7684\u6469\u64e6\u529b\u5927\u5c0f\u4e0d\u53d8
D\uff0e\u7269\u4f53A\u53d7\u5230\u7684\u5f39\u7c27\u62c9\u529b\u589e\u5927
13\uff0e\u5982\u56fe\u6240\u793a\uff0c\u8d28\u91cf\u4e3am1\u548cm2\u7684\u4e24\u4e2a\u7269\u4f53\u7528\u7ec6\u7ebf\u76f8\u8fde\uff0c\u5728\u5927\u5c0f\u6052\u5b9a\u7684\u62c9\u529bF\u4f5c\u7528\u4e0b\uff0c\u5148\u6cbf\u6c34\u5e73\u9762\uff0c\u518d\u6cbf\u659c\u9762\uff0c\u6700\u540e\u7ad6\u76f4\u5411\u4e0a\u8fd0\u52a8\uff0c\u5728\u4e09\u4e2a\u9636\u6bb5\u7684\u8fd0\u52a8\u4e2d\uff0c\u7ebf\u4e0a\u62c9\u529b\u7684\u5927\u5c0f ( )
A\uff0e\u7531\u5927\u53d8\u5c0f B\uff0e\u7531\u5c0f\u53d8\u5927
C\uff0e\u59cb\u7ec8\u4e0d\u53d8 D\uff0e\u7531\u5927\u53d8\u5c0f\u518d\u53d8
14\uff0e\u4e00\u4e2a\u5c0f\u5b69\u5728
\u4e0a\u505a\u6e38\u620f\uff0c\u4ed6\u4ece\u9ad8\u5904\u843d\u5230
\u4e0a\u540e\u53c8\u88ab\u5f39\u8d77\u5230\u539f\u9ad8\u5ea6\uff0c\u5c0f\u5b69\u4ece\u9ad8\u5904\u5f00\u59cb\u4e0b\u843d\u5230\u5f39\u56de\u7684\u6574\u4e2a\u8fc7\u7a0b\u4e2d\uff0c\u4ed6\u7684
\u968f\u65f6\u95f4\u7684\u53d8\u5316\u56fe\u8c61\u5982\u56fe\u6240\u793a\uff0c\u56fe\u4e2d\u65f6\u523b1\u30012\u30013\u30014\u30015\u30016\u4e3a\u5df2\u77e5\uff0coa\u6bb5\u548ccd\u6bb5\u4e3a\u76f4\u7ebf\uff0c\u5219\u6839\u636e\u6b64\u56fe\u8c61\u53ef\u77e5\uff0c\u5c0f\u5b69\u548c
\u76f8\u63a5\u89e6\u7684\u65f6\u95f4\u4e3a .
15\uff0e\u5982\u56fe\u5e95\u5750A\u4e0a\u88c5\u6709\u4e00\u6839\u76f4\u7acb\u957f\u6746\uff0c\u5176\u603b\u8d28\u91cf\u4e3aM\uff0c\u6746\u4e0a\u5957\u6709\u8d28\u91cf\u4e3am\u7684\u73afB\uff0c\u5b83\u4e0e\u6746\u6709\u6469\u64e6\uff0c\u5f53\u73af\u4ece\u5e95\u5ea7\u4ee5\u521d\u901f\u5411\u4e0a\u98de\u8d77\u65f6(\u5e95\u5ea7\u4fdd\u6301\u9759\u6b62)\uff0c\u73af\u7684\u52a0\u901f\u5ea6\u4e3aa\uff0c\u73af\u5728\u5347\u8d77\u7684\u8fc7\u7a0b\u4e2d\uff0c\u5e95\u5ea7\u5bf9\u6c34\u5e73\u9762\u7684\u538b\u529b _______ N\u548c\u4e0b\u843d\u7684\u8fc7\u7a0b\u4e2d\uff0c\u5e95\u5ea7\u5bf9\u6c34\u5e73\u9762\u7684\u538b\u529b____ N
16\uff0e\u5982\u56fe\uff0c\u4f20\u9001\u5e26\u4e0e\u5730\u9762\u503e\u89d2\u03b8=37\u00b0\uff0c\u4eceA\u2192B\u957f\u5ea6\u4e3a16m\uff0c\u4f20\u9001\u5e26\u4ee5l0m/s\u7684\u901f\u7387\u9006\u65f6\u9488\u8f6c\u52a8\uff0e\u5728\u4f20\u9001\u5e26\u4e0a\u7aefA\u65e0\u521d\u901f\u5ea6\u5730\u653e\u4e00\u4e2a\u8d28\u91cf\u4e3a0.5kg\u7684\u7269\u4f53\uff0c\u5b83\u4e0e\u4f20\u9001\u5e26\u4e4b\u95f4\u7684
\u56e0\u6570\u4e3a0.5\uff0e\u7269\u4f53\u4eceA\u8fd0\u52a8\u5230B\u9700\u65f6\u95f4 s?(sin37\u00b0=0.6\uff0ccos37\u00b0=0.8)
17\uff0e\u5982\u56fe\uff0c\u8d28\u91cf\uff0cm\uff1dlkg\u7684\u7269\u5757\u653e\u5728\u503e\u89d2\u4e3a\u03b8\u7684\u659c\u9762\u4e0a\uff0c\u659c\u9762\u4f53\u8d28\u91cfM=2kg\uff0c\u659c\u9762\u4e0e\u7269\u5757\u7684\u52a8\u6469\u64e6\u56e0\u6570\u03bc\uff1d0.2\uff0c\u5730\u9762\u5149\u6ed1\uff0c\u03b8=37\u00b0\uff0c\u73b0\u5bf9\u659c\u9762\u4f53\u65bd\u4e00\u6c34\u5e73\u63a8\u529bF\uff0c\u8981\u4f7f\u7269\u4f53m\u76f8\u5bf9\u659c\u9762\u9759\u6b62\uff0c\u529bF\u7684\u8303\u56f4 ?(\u8bbe\u7269\u4f53\u4e0e\u659c\u9762\u7684
\u7b49\u4e8e
\uff0cg\u53d610m\uff0fs2)
18\uff0e\u5982\u56fe\u6240\u793a\uff0c\u5728\u52a8\u529b\u5c0f\u8f66\u4e0a\u56fa\u5b9a\u4e00\u76f4\u89d2\u786c\u6746ABC\uff0c\u5206\u522b\u7cfb\u5728\u6c34\u5e73\u76f4\u6746AB\u4e24\u7aef\u7684\u8f7b\u5f39\u7c27\u548c\u7ec6\u7ebf\u5c06\u5c0f\u7403P
\u8d77\u6765.\u8f7b\u5f39\u7c27\u7684
\u4e3ak\uff0c\u5c0f\u7403P\u7684\u8d28\u91cf\u4e3am\uff0c\u5f53\u5c0f\u8f66\u6cbf\u6c34\u5e73\u5730\u9762\u4ee5\u52a0\u901f\u5ea6a\u5411\u53f3\u8fd0\u52a8\u800c\u8fbe\u5230\u7a33\u5b9a\u72b6\u6001\u65f6\uff0c\u8f7b\u5f39\u7c27\u4fdd\u6301\u7ad6\u76f4\uff0c\u800c\u7ec6\u7ebf\u4e0e\u6746\u7684\u7ad6\u76f4\u90e8\u5206\u7684\u5939\u89d2\u4e3a\u03b8\uff0c\u8bd5\u6c42\u6b64\u65f6\u5f39\u7c27\u7684\u5f62\u53d8\u91cf.
19\uff0e\u5728
\u4e0a\uff0c\u6211\u56fd\u8fd0\u52a8\u5458
\u7b2c\u4e00\u6b21\u53c2\u52a0\u8e66\u5e8a\u9879\u76ee\u7684\u6bd4\u8d5b\u5373\u53d6\u5f97\u4e86\u7b2c\u4e09\u540d\u7684\u4f18\u5f02\u6210\u7ee9\uff0e\u5047\u8bbe\u8868\u6f14\u65f6\u8fd0\u52a8\u5458\u4ec5\u5728\u7ad6\u76f4\u65b9\u5411\u8fd0\u52a8\uff0c\u901a\u8fc7\u4f20\u611f\u5668\u5c06\u5f39\u7c27\u5e8a\u9762\u4e0e\u8fd0\u52a8\u5458\u95f4\u7684\u5f39\u529b\u968f\u65f6\u95f4\u53d8\u5316\u7684\u89c4\u5f8b\u5728\u8ba1\u7b97\u673a\u4e0a\u7ed8\u5236\u51fa\u5982\u56fe\u6240\u793a\u7684\u66f2\u7ebf\uff0c\u5f53\u5730
\u4e3ag=10m\uff0fs2\uff0c\u4f9d\u636e\u56fe\u8c61\u7ed9\u51fa\u7684\u4fe1\u606f\uff0c\u56de\u7b54\u4e0b\u5217
\u80fd\u5426\u6c42\u51fa\uff0c\u5982\u80fd\u6c42\u51fa\u5199\u51fa\u5fc5\u8981\u7684\u8fd0\u7b97\u8fc7\u7a0b\u548c\u6700\u540e\u7ed3\u679c\uff0e
(1)\u8e66\u5e8a\u8fd0\u52a8\u7a33\u5b9a\u540e\u7684\u8fd0\u52a8\u5468\u671f\uff1b
(2)\u8fd0\u52a8\u5458\u7684\u8d28\u91cf\uff1b
(3)\u8fd0\u52a8\u8fc7\u7a0b\u4e2d\uff0c\u8fd0\u52a8\u5458\u79bb\u5f00\u5f39\u7c27\u5e8a\u4e0a\u5347\u7684\u6700\u5927\u9ad8\u5ea6\uff1b
(4)\u8fd0\u52a8\u8fc7\u7a0b\u4e2d\u8fd0\u52a8\u5458\u7684\u6700\u5927\u52a0\u901f\u5ea6\u3002
20\uff0e\u5982\u56fe\uff0c\u659c\u9762\u503e\u89d2\u4e3a\u03b8\uff0c\u5288\u5f62\u7269P\u4e0a\u8868\u9762\u4e0em\u7684\u52a8\u6469\u64e6\u56e0\u6570\u4e3a\u03bc\uff0cP\u4e0a\u8868\u9762\u6c34\u5e73\uff0c\u4e3a\u4f7fm\u968fP\u4e00\u8d77\u8fd0\u52a8\uff0c\u5f53P\u4ee5\u52a0\u901f\u5ea6a\u6cbf\u659c\u9762\u5411\u4e0a\u8fd0\u52a8\u65f6\uff0c\u5219\u03bc\u4e0d\u5e94\u5c0f\u4e8e\u591a\u5c11?\u5f53P\u5728\u5149\u6ed1\u659c\u9762\u4e0a\u81ea\u7531\u4e0b\u6ed1\u65f6\uff0c\u03bc\u4e0d\u5e94\u5c0f\u4e8e\u591a\u5c11?
21\uff0e\u4e00\u5706\u76d8\u9759\u6b62\u5728\u684c\u5e03\u4e0a\uff0c\u4f4d\u4e8e\u4e00
\u7684\u6c34\u5e73\u684c\u9762\u7684\u4e2d\u592e\u3002\u684c\u5e03\u7684\u4e00\u8fb9\u4e0e\u684c\u7684AB\u8fb9\u91cd\u5408\uff0c\u5982\u56fe\u793a\uff0c\u5df2\u77e5\u76d8\u4e0e\u684c\u5e03\u95f4\u7684\u52a8\u6469\u64e6\u56e0\u6570\u4e3a\u03bc1\uff0c\u76d8\u4e0e\u684c\u9762\u95f4\u7684\u52a8\u6469\u64e6\u56e0\u6570\u4e3a\u03bc2\uff0c\u73b0\u7a81\u7136\u4ee5\u6052\u5b9a\u52a0\u901f\u5ea6a\u5c06\u684c\u5e03\u62bd\u79bb\u684c\u9762\uff0c\u52a0\u901f\u5ea6\u7684\u65b9\u5411\u662f\u6c34\u5e73\u7684\u4e14\u5782\u76f4\u4e8eAB\u8fb9\u3002\u82e5\u5706\u76d8\u6700\u540e\u672a\u4ece\u684c\u9762\u6389\u4e0b\uff0c\u5219\u52a0\u901f\u5ea6a\u6ee1\u8db3\u7684\u6761\u4ef6\u662f\u4ec0\u4e48\uff1f\uff08\u4ee5g\u8868\u793a
\uff09
\u300a
\u300b\u7ec3\u4e60\u9898
1\u3001B 2\u3001A 3\u3001C 4\u3001C 5\u3001C 6\u3001D 7\u3001ABD
8\u3001C 9\u3001BD 10\u3001ABC 11\u3001D 12\u3001AC 13\u3001C
14\u3001 15\u3001\u3001
16\u30012s 17\u3001
18\uff0e\u89e3\uff1aTsin \u03b8=ma
Tcos \u03b8+F=mg
F=kx x= m(g-acot \u03b8)/ k
\u8ba8\u8bba\uff1a\u2460\u82e5a cot\u03b8\uff1cg \u5219\u5f39\u7c27\u4f38\u957fx= m(g-acot \u03b8)/ k
\u2461\u82e5acot \u03b8=g \u5219\u5f39\u7c27\u4f38\u957fx= 0
\u2462\u82e5acot \u03b8\uff1eg \u5219\u5f39\u7c27\u538b\u7f29x=m(acot\u03b8-g)/ k
19\u3001\u89e3\uff1a(1)\u5468\u671f\u53ef\u4ee5\u6c42\u51fa\uff0c\u7531\u56fe\u8c61\u53ef\u77e5T=9.5-6.7=2.8s
(2)\u8fd0\u52a8\u5458\u7684\u8d28\u91cf\u53ef\u4ee5\u6c42\u51fa\uff0c\u7531\u56fe\u8c61\u53ef\u77e5\u8fd0\u52a8\u5458\u8fd0\u52a8\u524dmg=Fo=500N m=50kg
(3)\u8fd0\u52a8\u5458\u4e0a\u5347\u7684\u6700\u5927\u9ad8\u5ea6\u53ef\u4ee5\u6c42\u51fa\uff0c
\u7531\u56fe\u8c61\u53ef\u77e5\u8fd0\u52a8\u5458\u8fd0\u52a8\u7a33\u5b9a\u540e\u6bcf\u6b21\u817e\u7a7a\u65f6\u95f4\u4e3a\uff1a8.7-6.7=2s
(4)\u8fd0\u52a8\u8fc7\u7a0b\u4e2d\u8fd0\u52a8\u5458\u7684\u6700\u5927\u52a0\u901f\u5ea6\u53ef\u4ee5\u6c42\u51fa\uff0c \u8fd0\u52a8\u5458\u6bcf\u6b21\u817e\u7a7a\u65f6\u52a0\u901f\u5ea6al=g=10m/s2\uff0c\u800c\u9677\u843d\u6700\u6df1\u65f6\u7531\u56fe\u8c61\u53ef\u77e5 Fm=2500N
\u6b64\u65f6\u7531
Fm-mg=mam
\u53ef\u5f97\u6700\u5927\u52a0\u901f\u5ea6
21\u3001\u89e3\uff1a\u8bbe\u5706\u76d8\u7684\u8d28\u91cf\u4e3am\uff0c\u684c\u957f\u4e3al\uff0c\u5728\u684c\u5e03\u4ece\u5706\u76d8\u4e0b\u62bd\u51fa\u7684\u8fc7\u7a0b\u4e2d\uff0c\u76d8\u7684\u52a0\u901f\u5ea6\u4e3aa1\uff0c\u6709
\u684c\u5e03\u62bd\u51fa\u540e\uff0c\u76d8\u5728\u684c\u9762\u4e0a\u4f5c\u5300\u51cf\u901f\u8fd0\u52a8\uff0c\u4ee5a2\u8868\u793a\u52a0\u901f\u5ea6\u7684\u5927\u5c0f\uff0c\u6709
\u8bbe\u76d8\u521a\u79bb\u5f00\u684c\u5e03\u65f6\u7684\u901f\u5ea6\u4e3av1\uff0c\u79fb\u52a8\u7684\u8ddd\u79bb\u4e3as1\uff0c\u79bb\u5f00\u684c\u5e03\u540e\u5728\u684c\u9762\u4e0a\u518d\u8fd0\u52a8\u8ddd\u79bbs2\u540e\u4fbf\u505c\u4e0b\uff0c\u6709
\u76d8\u6ca1\u6709\u4ece\u684c\u9762\u4e0a\u6389\u4e0b\u7684\u6761\u4ef6\u662f
\u8bbe\u684c\u5e03\u4ece\u76d8\u4e0b\u62bd\u51fa\u6240\u7ecf\u5386\u65f6\u95ee\u4e3at\uff0c\u5728\u8fd9\u6bb5\u65f6\u95f4\u5185\u684c\u5e03\u79fb\u52a8\u7684\u8ddd\u79bb\u4e3as\uff0c\u6709
\u800c
\u7531\u4ee5\u4e0a\u5404\u5f0f\u89e3\u5f97
1. x⁴\uff0b4y⁴\uff1d\ufe59x²\uff0b2y²\ufe5a²\uff0d4x²y²\uff1d\ufe59x²\uff0b2y²\uff0b2xy\ufe5a\ufe59x²\uff0b2y²\uff0d2xy\ufe5a
2. x⁴\uff0d6x²y²\uff0b9y⁴\uff1d\ufe59x²\uff0d3y²\ufe5a²
3. \u2235x-1/x=2
\u2234x²\uff0d2\uff0b1/x²\uff1d4
\u2234x²\uff0b1/x²\uff1d6
\u2234x⁴\uff0b1/x⁴\uff1d\ufe59x²\uff0b1/x²\ufe5a²\uff0d2\uff1d6²\uff0d2\uff1d34
4. x⁴\uff0bx²y²\uff0by⁴\uff1dx⁴\uff0b2x²y²\uff0by⁴\uff0dx²y²\uff1d\ufe59x²\uff0by²\ufe5a²\uff0dx²y²
\uff1d\ufe59x²\uff0by²\uff0bxy\ufe5a\ufe59x²\uff0by²\uff0dxy\ufe5a
5. \u2235a²\uff0bb²\uff0bc²\uff1dab+bc+ac
\u22342a²\uff0b2b²\uff0b2c²\uff1d2ab\uff0b2bc\uff0b2ac
\u22342a²\uff0b2b²\uff0b2c²\uff0d2ab\uff0d2bc\uff0d2ac\uff1d0
\u2234a²\uff0d2ab\uff0bb²\uff0bb²\uff0d2bc\uff0bc²\uff0ba²\uff0d2ac\uff0bc²\uff1d0
\u2234\ufe59a\uff0db\ufe5a²\uff0b\ufe59b\uff0dc\ufe5a²\uff0b\ufe59a\uff0dc\ufe5a²\uff1d0
\u2235\ufe59a\uff0db\ufe5a²\u22650 \ufe59b\uff0dc\ufe5a²\u22650\ufe59a\uff0dc\ufe5a²\u22650
\u2234a\uff0db\uff1d0 b\uff0dc\uff1d0 a\uff0dc\uff1d0
\u2234a=b b=c a=c\u2234
a=b=c \u5373\u6b64\u4e09\u89d2\u5f62\u662f\u7b49\u8fb9\u4e09\u89d2\u5f62
6. \u2235\ufe59a²\uff0bb²\ufe5a\ufe59a²\uff0bb²\uff0d3\ufe5a\uff0d10\uff1d0
\u2234\ufe59a²\uff0bb²\ufe5a²\uff0d3\ufe59a²\uff0bb²\ufe5a\uff0d10=0
\u2234\ufe59a²\uff0bb²\uff0d5\ufe5a\ufe59a²\uff0bb²\uff0b2\ufe5a\uff1d0
\u2235a²\uff0bb²\uff0b2\u22600
\u2234a²\uff0bb²\uff0d5\uff1d0
\u2234a²\uff0bb²\uff1d5
100\uff05\u6b63\u786e\uff0c\u5c3d\u7ba1\u91c7\u7eb3\u3002
1118
（1+1+1）×8
2
1126
（1+1）×2×6，（1+1+2）×6
3
1127
（1+2）×（1+7）
4
1128
（1+2）×8×1
5
1129
（9-1）×（2+1）
6
1134
（1+1）×3×4
7
1135
（1+3）×（1+5）
8
1136
（1+3）×6×1,(1+1+6)×3
9
1137
（1+7）×3×1
10
1138
3×8×1×1, 3×8+1-1 , 3×8÷1÷1
11
1139
（9-1）×3×1，（3+9）×（1+1）
12
1144
（1+1+4）×4
13
1145
（1+5）×4×1
14
1146
4×6×1×1, 4×6+1-1, 4×6÷1÷1
15
1147
（7-1）×4×1 ，（ 7+1）×（4-1）
16
1148
（4+8）×（1+1），（8-1-1）×4，（4-1）×8×1
17
1149
（9-1）×（4-1）
18
1155
5×5×1-1 ，（5-1）×（5+1）5×5÷1-1，5×5-1×1 ,5×5-1÷1
19
1156
5×（6-1）-1，（ 5-1）×6×1
20
1157
（7-5）×（1+1），（7-1）×（5-1）
21
1158
（5-1-1）×8
22
1166
（6+6）×（1+1），（6-1-1）×6
23
1168
6÷（1+1）×8，8÷（1+1）×6
24
1169
（1+1）×9+6
25
1188
（1+1）×8+8
26
1224
（1+2）×2×4
27
1225
（1+5）×2×2
28
1226
（2+2）×6×1,6×2×2×1，（1+2）×（2+6）
29
1227
（7-1）×2×2
30
1228
（2+2-1）×8，（2×2-1）×8
31
1229
（1+2+9）×2
32
1233
（1+3）×2×3
33
1234
1×2×3×4，（1+3）×（2+4）
34
1235
2×3×（5-1），（1+2）×（3+5）
35
1236
（3+2-1）×6，（6+2）×3×1，（3-1）×6×2
36
1237
3×7+1+2，（7+2-1）×3
37
1238
（8+3+1）×2，（2-1）×3×8，（8-2）×（3+1）
38
1239
（3+9）×2×1，（9+1-2）×3, 3×9-（2+1）
39
1244
（4+2）×4×1，（4+4）×（2+1）
40
1245
（5+2-1）×4
41
1246
（6+2）×（4-1），4×6×（2-1）
42
1247
（7+1-2）×4，（4+7+1）×2
43
1248
（4+1-2）×8，（8-2）×4×1，（4+8）×2×1
44
1249
（9-2-1）×4，（9+1）×2+4，（9+4-1）×2
45
1255
5×5+1-2
46
1256
（5+1-2）×6，（5+1+6）×2
47
1257
（7+5）×2×1，（5-2）×（1+7），（7-2）×5-1
48
1258
（5+8-1）×2，（5-2）×8×1，（5-1）×（8-2）
49
1259
（9-1）×（5-2），2×9+5+1
50
1266
（6+6）×2×1，（6-2）×6×1，（1+2）×6+6
这哪有解啊，去网上找这个应用，多练练就是了，没有题库的
绛旓細浣嗚杈惧埌24锛屽彲浠ュ皢-12鍔犲埌鍚庨潰锛屾渶缁堣〃杈惧紡鍙樹负-12+12锛岀粨鏋滀负0銆傛荤殑鏉ヨ锛24鐐娓告垙涓嶄粎鏄鍩烘湰杩愮畻鐨勭啛缁冭繍鐢紝鏇磋冮獙鐜╁鐨勫垱鏂版濈淮鍜岄昏緫鍒嗘瀽鑳藉姏銆傛瘡涓棰樼洰閮芥湁澶氱瑙ｆ硶锛屽叧閿湪浜庢壘鍒版渶绠娲佹湁鏁堢殑璺緞锛岃鏁板瓧闂寸殑杩愮畻杈惧埌鐩爣缁撴灉銆傞氳繃杩欐牱鐨勬父鎴锛屾暟瀛︿笉鍐嶆灟鐕ワ紝鑰屾槸鍏呮弧浜嗚叮鍛虫у拰鎸戞垬鎬с
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绛旓細4銆 6 梅 4 脳(9 + 7)5銆 (6 梅 4) 脳 (9 + 7)6銆6 梅 (4 梅 (9 + 7))7銆(6 脳 (7 + 9)) 梅 4 8銆6 脳 (7 + 9) 梅 4 9銆6 脳 ((7 + 9) 梅 4)10銆(6 脳 (9 + 7)) 梅 4 鍒╃敤3脳8=24銆4脳6=24銆2脳12=24姹傝В銆傛妸鐗岄潰涓婄殑鍥涗釜鏁版兂鍔炴硶鍑戞垚...
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绛旓細(11*11-1)/5=24 4/(1-5/6)=24
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