数学十字交叉法怎么算，能给我举几个例子吗？最好还有解析。 十字交叉法的数学应用
\u5341\u5b57\u4ea4\u53c9\u6cd5\u7684\u6570\u5b66\u539f\u7406\u53ca\u5b9e\u9645\u5e94\u7528\u5341\u5b57\u4ea4\u53c9\u6cd5\u4e13\u9898\u5341\u5b57\u4ea4\u53c9\u6cd5\u53ef\u9002\u7528\u4e8e\u89e3\u4e24\u79cd\u6574\u4f53\u7684\u6df7\u5408\u7684\u76f8\u5173\u8bd5\u9898\uff0c\u57fa\u672c\u539f\u7406\u5982\u4e0b\uff1a
\u6df7\u5408\u524d
\u6574\u4f53\u4e00\uff0c\u6570\u91cfx\uff0c\u6307\u6807\u91cfa
\u6574\u4f53\u4e8c\uff0c\u6570\u91cfy\uff0c\u6307\u6807\u91cfb\uff08a>b\uff09
\u6df7\u5408\u540e
\u6574\u4f53\uff0c\u6570\u91cf\uff08x+y\uff09\uff0c\u6307\u6807\u91cfc
\u53ef\u5f97\u5230\u5982\u4e0b\u5173\u7cfb\u5f0f\uff1a
x\u00d7a+y\u00d7b=\uff08x+y\uff09c
\u63a8\u51fa\uff1a
x\u00d7\uff08a-c\uff09=y\u00d7\uff08c-b\uff09
\u5f97\u5230\u516c\u5f0f\uff1a
\uff08a-c\uff09\uff1a\uff08c-b\uff09=y\uff1ax
\u5219\u4efb\u610f\u77e5\u9053x\u3001y\u3001a\u3001b\u3001c\u4e2d\u7684\u56db\u4e2a\uff0c\u53ef\u4ee5\u6c42\u51fa\u672a\u77e5\u91cf\u3002\u4e0d\u8fc7\uff0c\u6c42\uff43\u7684\u8bdd\uff0c\u76f4\u63a5\u8ba1\u7b97\u66f4\u4e3a\u7b80\u5355\u3002\u5f53\u77e5\u9053x+y\u65f6\uff0cx\u6216y\u4efb\u610f\u77e5\u9053\u4e00\u4e2a\u4e5f\u53ef\u91c7\u7528\u6b64\u6cd5\uff1b\u77e5\u9053\uff58\uff1a\uff59\u4e5f\u53ef\u4ee5\u3002
\u76f8\u5173\u7684\u6307\u6807\u91cf\u53ef\u4ee5\u662f\u5e73\u5747\u503c\u3001\u6d53\u5ea6\u7b49\u7b49\u3002\u4e3e\u4f8b\u5982\u4e0b\uff1a
1\uff0e\u6c42\u6307\u6807\u91cfa\u3001b\u4e4b\u4e00
\u4f8b1\uff0e\u7532\u5bb9\u5668\u4e2d\u6709\u6d53\u5ea6\u4e3a4%\u7684\u76d0\u6c34150\u514b\uff0c\u4e59\u5bb9\u5668\u4e2d\u6709\u67d0\u79cd\u6d53\u5ea6\u7684\u76d0\u6c34\u82e5\u5e72\uff0c\u4ece\u4e59\u4e2d\u53d6\u51fa450\u514b\u76d0\u6c34\u653e\u5165\u7532\u4e2d\u6df7\u6210\u6d53\u5ea6\u4e3a8.2%\u7684\u76d0\u6c34\uff0c\u95ee\u4e59\u5bb9\u5668\u4e2d\u76d0\u6c34\u7684\u6d53\u5ea6\u662f\u591a\u5c11\uff1f
A.9.6% B.9.8% C.9.9% D.10%
\u89e3\u6790\uff1a\u5df2\u77e5\u4ece\u4e59\u5bb9\u5668\u4e2d\u53d6\u51fa\u7684\u76d0\u6c34\u91cfx=450\uff0c\u7532\u5bb9\u5668\u4e2d\u539f\u6709\u76d0\u6c34\u91cfy=150\uff0c\u7532\u5bb9\u5668\u4e2d\u539f\u6709\u76d0\u6c34\u6d53\u5ea6b=4%\uff0c\u6df7\u5408\u540e\u76d0\u6c34\u6d53\u5ea6c=8.2%\uff0c\u53ef\u5f97\u5230\uff08a-8.2%\uff09\uff1a\uff088.2%-4%\uff09=150\uff1a450\uff0c\u5219b-8.2%=4.2%\u00f73=1.4%\uff0c\u5373\u4e59\u5bb9\u5668\u4e2d\u76d0\u6c34\u6d53\u5ea6b=9.6%
\u6b63\u786e\u7b54\u6848\uff1aA
\u4f8b2\uff0e\u67d0\u8f66\u95f4\u8fdb\u884c\u5b63\u5ea6\u8003\u6838\uff0c\u6574\u4e2a\u8f66\u95f4\u5e73\u5747\u5206\u662f85\u5206\uff0c\u5176\u4e2d2\uff0f3\u7684\u4eba\u5f9780\u5206\u4ee5\u4e0a(\u542b80\u5206)\uff0c\u4ed6\u4eec\u7684\u5e73\u5747\u5206\u662f90\u5206\uff0c\u5219\u4f4e\u4e8e80\u5206\u7684\u4eba\u7684\u5e73\u5747\u5206\u662f\u591a\u5c11?
A\uff0e68 B\uff0e70 C.75 D\uff0e78
\u89e3\u6790\uff1a 90 10 2
85
x 5 1
x=75
\u6b63\u786e\u7b54\u6848\uff1aC
2\uff0e\u6c42\u6570\u91cfx\u3001y\u4e4b\u4e00
\u4f8b1\uff0e\u8f66\u95f4\u517140\u4eba\uff0c\u67d0\u6b21\u6280\u672f\u64cd\u4f5c\u8003\u6838\u7684\u5e73\u5747\u6210\u7ee9\u4e3a80\u5206\uff0c\u5176\u4e2d\u7537\u5de5\u5e73\u5747\u6210\u7ee9\u662f83\u5206\uff0c\u5973\u5de5\u5e73\u5747\u6210\u7ee9\u4e3a78\u5206\uff0c\u8be5\u8f66\u95f4\u6709\u5973\u5de5\u591a\u5c11\u4eba\uff1f
A.16\u4eba B.18\u4eba C.20\u4eba D.24\u4eba
\u89e3\u6790\uff1a\u5df2\u77e5\u7537\u5de5\u5e73\u5747\u6210\u7ee9a=83\uff0c\u5973\u5de5\u5e73\u5747\u6210\u7ee9b=78\uff0c\u603b\u5e73\u5747\u6210\u7ee9c=80\uff0c\u8f66\u95f4\u603b\u4eba\u6570x+y=40\uff0c\u5219y\uff1ax=\uff0883-80\uff09\uff1a\uff0880-78\uff09=3\uff1a2\uff0c\u5219\u5973\u5de5\u4eba\u6570y=40\u00d73\u00f7\uff083+2\uff09=24\u4eba\u3002
\u6b63\u786e\u7b54\u6848\uff1aD
\u4f8b2\uff0e\u6709\u6d53\u5ea6\u4e3a4%\u7684\u76d0\u6c34\u82e5\u5e72\u514b\uff0c\u84b8\u53d1\u4e86\u4e00\u4e9b\u6c34\u5206\u540e\u6d53\u5ea6\u53d8\u621010%\uff0c\u518d\u52a0\u5165300\u514b4%\u7684\u76d0\u6c34\u540e\uff0c\u6d53\u5ea6\u53d8\u4e3a6.4%\u7684\u76d0\u6c34\uff0c\u95ee\u6700\u521d\u7684\u76d0\u6c34\u591a\u5c11\u514b?
A.200\u514b B.300\u514b C.400\u514b D.500\u514b
\u89e3\u6790\uff1a\u5df2\u77e5\u539f\u6709\u76d0\u6c34\u84b8\u53d1\u540e\u6d53\u5ea6a=10%\uff0c\u52a0\u5165\u7684\u76d0\u6c34\u6d53\u5ea6\u4e3ab=4%\uff0c\u91cd\u91cf\u4e3ay=300\u514b\uff0c\u6df7\u5408\u540e\u76d0\u6c34\u6d53\u5ea6c=6.4%\uff0c\u5219y\uff1ax=\uff0810%-6.4%\uff09\uff1a\uff086.4%-4%\uff09=3\uff1a2\uff0c\u5219\u539f\u6709\u76d0\u6c34\u84b8\u53d1\u540e\u4e3a300\u00f73\u00d72=200\u514b\uff0c\u6700\u521d\u76d0\u6c34\u4e3a200\u00d710%\u00f74%=500\u514b\u3002
\u6b63\u786e\u7b54\u6848\uff1aD
1 \u67d0\u5e02\u73b0\u670970\u4e07\u4eba\u53e3\uff0c\u5982\u679c5\u5e74\u540e\u57ce\u9547\u4eba\u53e3\u589e\u52a04%\uff0c\u519c\u6751\u4eba\u53e3\u589e\u52a05.4%\uff0c\u5219\u5168\u5e02\u4eba\u53e3\u5c06\u589e\u52a04.8%\uff0c\u90a3
\u8fd9\u4e2a\u57ce\u5e02\u73b0\u6709\u57ce\u9547\u4eba\u53e3\u591a\u5c11\uff1f
A30B31.2C40D41.6
\u8bbe\u73b0\u6709\u57ce\u9547\u4eba\u53e3X\u4e07
\u57ce\u5e02X 4% 0.6%
4.8% 0.6%/0.8%=3/4 \u5373X\u4e3a30\u4e07\u4eba
\u5bb6\u675170-X 5.4% 0.8%
2 \u4e00\u5757\u8bd5\u9a8c\u7530\uff0c\u4ee5\u524d\u8fd9\u5757\u5730\u6240\u79cd\u690d\u7684\u662f\u666e\u901a\u6c34\u7a3b\u3002\u73b0\u5728\u5c06\u8be5\u8bd5\u9a8c\u7530\u76841/3\u79cd\u4e0a\u8d85\u7ea7\u6c34\u7a3b\uff0c\u6536\u5272\u65f6\u53d1\u73b0\u8bd5\u9a8c\u7530\u6c34\u7a3b\u603b\u4ea7\u91cf\u662f\u4ee5\u524d\u603b\u4ea7\u91cf\u76841.5\u500d\u3002\u5982\u679c\u666e\u901a\u6c34\u7a3b\u7684\u4ea7\u91cf\u4e0d\u53d8\uff0c\u90a3\u4e48\u8d85\u7ea7\u6c34\u7a3b\u7684\u5e73\u5747\u4ea7\u91cf\u4e0e\u666e\u901a\u6c34\u7a3b\u7684\u5e73\u5747\u4ea7\u91cf\u4e4b\u6bd4\u662f\uff08 \uff09\u3002
A\uff0e5\uff1a2 B\u30014\uff1a3 C\u30013\uff1a1 D\u30012\uff1a1
\u8bbe\u8d85\u7ea7\u6c34\u7a3b\u7684\u5e73\u5747\u4ea7\u91cf\u662f\u666e\u901a\u6c34\u7a3b\u7684X\u500d
\u8d85\u7ea7\u6c34\u7a3b X 0.5 1/3
1.5 0.5/X-1.5=1/3/2/3 X=2.5
1 X-1.5 2/3
3 \u67d0\u73ed\u7537\u751f\u6bd4\u5973\u751f\u4eba\u6570\u591a80%\uff0c\u4e00\u6b21\u8003\u8bd5\u540e\uff0c\u5168\u73ed\u5e73\u5747\u6210\u7ea7\u4e3a75 \u5206\uff0c\u800c\u5973\u751f\u7684\u5e73\u5747\u5206\u6bd4\u7537\u751f\u7684\u5e73\u5747\u5206\u9ad820% \uff0c\u5219\u6b64\u73ed\u5973\u751f\u7684\u5e73\u5747\u5206\u662f\uff1a
\u3000\u3000A \uff0e84 \u5206\u3000\u3000B . 85 \u5206 \u3000\u3000C . 86 \u5206 \u3000\u3000D . 87 \u5206
\u6839\u636e\u7537\u751f\u6bd4\u5973\u751f\u4eba\u6570\u591a80%.\u56e0\u6b64\u7537\u5973\u751f\u4eba\u6570\u6bd4\u4e3a180:100=9:5
\u8bbe\u7537\u751f\u5e73\u5747\u5206\u662fX,\u5219\u7531\u5973\u751f\u7684\u5e73\u5747\u5206\u6bd4\u7537\u751f\u7684\u5e73\u5747\u5206\u9ad820%,\u5973\u751f\u5e73\u5747\u5206\u65701.2X
\u7537\u751f X 1.2X-75 9
75 1.2X-75/75-X=9/5 X=70
\u5973\u751f 1.2X 75-X
1.2X=1.2*70=84 ,\u56e0\u6b64\u5973\u751f\u7684\u5e73\u5747\u5206\u4e3a84\u5206
4 \u67d0\u673a\u5173\u5171\u6709\u5e72\u90e8\u804c\u5de5350\u4eba\uff0c\u5176\u4e2d55\u5c81\u4ee5\u4e0a\u5171\u670970\u4eba\u3002\u73b0\u62df\u8fdb\u884c\u673a\u6784\u6539\u9769\uff0c\u603b\u4f53\u89c4\u6a21\u538b\u7f29\u4e3a180\u4eba\uff0c\u5e76\u89c4\u5b9a55\u5c81\u4ee5\u4e0a\u7684\u4eba\u88c1\u51cf\u6bd4\u4f8b\u4e3a70%\u3002\u8bf7\u95ee55\u5c81\u4ee5\u4e0b\u7684\u4eba\u88c1\u51cf\u6bd4\u4f8b\u7ea6\u662f\u591a\u5c11\uff1f\uff08 \uff09
A.51% B.43% C.40% D.34%
\u8bbe55\u5c81\u4ee5\u4e0b\u7684\u4eba\u88c1\u51cf\u6bd4\u4f8b\u4e3aX,
>55\u5c81 70% 17/35-X 70
170/350 17/35-X/3/14=70/280 X=121/280
<55\u5c81 X 3/14 280
121/280~43%
5 \u67d0\u5e02\u5c45\u6c11\u751f\u6d3b\u7528\u7535\u6bcf\u6708\u6807\u51c6\u7528\u7535\u91cf\u7684\u57fa\u672c\u4ef7\u683c\u4e3a\u6bcf\u5ea60.50\u5143\uff0c\u82e5\u6bcf\u6708\u7528\u7535\u91cf\u8d85\u8fc7\u6807\u51c6\u7528\u7535\u91cf\uff0c\u8d85\u51fa\u90e8\u5206\u6309\u57fa\u672c\u4ef7\u683c\u768480\uff05\u6536\u8d39\uff0c\u67d0\u6237\u4e5d\u6708\u4efd\u7528\u753584\u5ea6\uff0c\u5171\u4ea4\u7535\u8d3939.6\u5143\uff0c\u5219\u8be5\u5e02\u6bcf\u6708\u6807\u51c6\u7528\u7535\u91cf\u4e3a\uff08 \uff09\u3002
A\uff0e60\u5ea6 B\uff0e65\u5ea6 C\uff0e70\u5ea6 D\uff0e75\u5ea6
\u8bbe\u6bcf\u6708\u6807\u51c6\u7528\u7535X\u5ea6
\u57fa\u7840 0.5 5/70 X
39.6/84 5/70/2/70=X/84-X X=60
\u6298\u6263 0.5*80% 2/70 84-X
6 \u67d0\u4f53\u80b2\u8bad\u7ec3\u4e2d\u5fc3\uff0c\u6559\u7ec3\u5458\u4e2d\u7537\u536090\uff05\uff0c\u8fd0\u52a8\u5458\u4e2d\u7537\u536080\uff05\uff0c\u5728\u6559\u7ec3\u5458\u548c\u8fd0\u52a8\u5458\u4e2d\u7537\u536082\uff05\uff0c\u6559\u7ec3\u5458\u4e0e\u8fd0\u52a8\u5458\u4eba\u6570\u4e4b\u6bd4\u662f
A\uff0e2\uff1a5 B\uff0e1\uff1a3 C\uff0e1\uff1a4 D\uff0e1\uff1a5
\u6559\u7ec3 90% 2% N\u6559
82% N\u6559/N\u961f=2%/8%=1:4
\u961f\u5458 80% 8% N\u961f
7 \u4e00\u53ea\u732b\u6bcf\u5929\u5403\u7531\u98df\u54c1A\u548c\u98df\u54c1B\u6405\u62cc\u6210\u7684\u98df\u7269300\u514b,\u98df\u54c1A\u7684\u86cb\u767d\u8d28\u542b\u91cf\u4e3a10%,\u98df\u54c1B\u7684\u86cb\u767d\u8d28\u542b\u91cf\u4e3a15%,\u5982\u679c\u8be5\u732b\u6bcf\u5929\u9700\u898138\u514b\u86cb\u767d\u8d28,\u95ee\u98df\u7269\u4e2d\u98df\u54c1A\u7684\u6bd4\u91cd\u662f\u767e\u5206\u4e4b\u51e0?
A47%B40%C1/3D50%
\u98df\u54c1A 10% 7/300 Na
38/300 Na/Nb=7/300/8/300=7/8
\u98df\u54c1B 15% 8/300 Nb
7/7+8 *100~ 47%
把2x²-7x+3分解因式.
分析：先分解二次项系数，分别写在十字交叉线的左上角和左下角，再分解常数项，分
别写在十字交叉线的右上角和右下角，然后交叉相乘，求代数和，使其等于一次项系数.
分解二次项系数(只取正因数 因为取负因数的结果与正因数结果相同！）。
2=1×2=2×1；
分解常数项：
3=1×3=3×1=(-3)×(-1)=(-1)×(-3).
用画十字交叉线方法表示下列四种情况：
1 1
╳
2 3
1×3+2×1=5 ≠-7
1 3
╳
2 1
1×1+2×3=7 ≠-7
1 -1
╳
2 -3
1×(-3)+2×(-1)=-5 ≠-7
1 -3
╳
2 -1
1×(-1)+2×(-3)=-7
经过观察，第四种情况是正确的，这是因为交叉相乘后，两项代数和恰等于一次项系数-7。
解 2x²-7x+3=(x-3)(2x-1)
http://baike.baidu.com/link?url=15HR4uAaE8ykyZyL961hlhRnJXxKq--QssYVqWdJ4t6CGklJ5MQxs3HjYC4EKAwHKCS1mdpnfhP2A_f2VhHvBa
绛旓細鍦ㄨ冭瘯杩囩▼涓紝鏁板杩愮畻妯″潡棰樼洰涓昏鏄氳繃浠ｅ叆鎺掗櫎娉曪紝鏁板瓧鐗规ф硶锛屾柟绋嬫硶锛岃祴鍊兼硶姹傝В銆備絾鏄湪鑰冨療涓浜涘姞鏉冨钩鍧囨暟闂鏃锛屽彲鑳浼氶亣鍒颁竴浜涜緝澶嶆潅鐨勯鐩紝鑻ラ噰鐢ㄥ父瑙勬柟娉——鏂圭▼娉曪紝鍦ㄥ垪寮忋佹眰瑙ｈ繃绋嬩腑闅惧害鍧囪緝澶э紝姹傝В杩囩▼绻佺悙鑰楄垂瀹濊吹鐨勬椂闂达紝姝ゆ椂濡傛灉鑳芥帉鎻鍗佸瓧浜ゅ弶娉锛屽彲澶уぇ闄嶄綆棰樼洰闅惧害锛...
绛旓細瑙ｆ柟绋嬫槸鏁板涓殑閲嶈鍐呭涔嬩竴锛屽崄瀛椾氦鍙夋硶鏄В涓鍏冧竴娆℃柟绋嬬殑涓绉嶇畝鍗曟湁鏁堢殑鏂规硶銆傛湰鏂囧皢璇︾粏浠嬬粛鍗佸瓧浜ゅ弶娉曠殑姝ラ鍜屽簲鐢ㄣ備竴銆佸崄瀛椾氦鍙夋硶鐨勫熀鏈粙缁 鍗佸瓧浜ゅ弶娉曟槸瑙ｄ竴鍏冧竴娆℃柟绋嬬殑涓绉嶇洿瑙傛槗鎳傜殑鏂规硶銆傚畠閫氳繃瑙傚療鏂圭▼涓殑绯绘暟鍜屽父鏁伴」涔嬮棿鐨勫叧绯伙紝鎵惧埌鏈煡鏁扮殑鍊笺傚崄瀛椾氦鍙夋硶浜庝簩鍏冪粍鍒嗘贩鍚堜綋绯荤殑璁＄畻...
绛旓細鏁板涓殑鍗佸瓧浜ゅ弶娉曟庝箞鏍风敤銆佽藩姹備娇鐢ㄦ柟娉曘... 鏁板涓殑鍗佸瓧浜ゅ弶娉曟庝箞鏍风敤銆佽藩姹備娇鐢ㄦ柟娉曘 灞曞紑 鎴戞潵绛 5涓洖绛 #鐑# 鍏堜汉涓姝,鎺㈢鍗庝负P50瀹濈洅 鍖垮悕鐢ㄦ埛 2013-08-19 灞曞紑鍏ㄩ儴 鍗佸瓧鐩镐箻娉曠殑鏂规硶绠鍗曠偣鏉ヨ灏辨槸:鍗佸瓧宸﹁竟鐩镐箻绛変簬浜屾椤圭郴鏁,鍙宠竟鐩镐箻绛変簬甯告暟椤,浜ゅ弶鐩镐箻鍐嶇浉鍔犵瓑浜庝竴娆￠」绯绘暟銆
绛旓細鍗佸瓧浜ゅ弶娉涓撻鍗佸瓧浜ゅ弶娉曞彲閫傜敤浜庤В涓ょ鏁翠綋鐨勬贩鍚堢殑鐩稿叧璇曢锛屽熀鏈師鐞嗗涓嬶細娣峰悎鍓嶏細鏁翠綋涓锛屾暟閲弜锛屾寚鏍囬噺a锛涙暣浣撲簩锛屾暟閲弝锛屾寚鏍囬噺b锛坅>b锛夈傛贩鍚堝悗锛氭暣浣擄紝鏁伴噺锛坸+y锛夛紝鎸囨爣閲廲 鍙緱鍒板涓嬪叧绯诲紡锛歺脳a+y脳b=锛坸+y锛塩 鎺ㄥ嚭锛歺脳锛坅-c锛=y脳锛坈-b锛夊緱鍒板叕寮忥細锛坅-c锛夛細锛坈-b锛...
绛旓細銆愪緥棰樸戠幇鏈100鍏嬬⒊閰搁攤鍜岀⒊閰搁挕鐨勬贩鍜岀墿锛屽畠浠拰涓瀹氭祿搴︾殑鐩愰吀鍙嶅簲鏃舵墍娑堣楃洂閰歌窡100鍏嬬⒊閰搁挋鍜岃娴撳害鐩愰吀鍙嶅簲鏃舵秷鑰楃洂閰搁噺鐩稿悓銆傝绠楁贩鍜岀墿涓⒊閰搁攤鍜岀⒊閰搁挕鐨勭墿璐ㄧ殑閲忎箣姣斻傘愬垎鏋愩戝彲灏嗙⒊閰搁挋鐨勫紡閲忕悊瑙ｄ负纰抽吀閿傚拰纰抽吀閽＄殑娣峰拰鐗╃殑骞冲潎寮忛噺锛屽埄鐢鍗佸瓧浜ゅ弶娉曡绠鍙緱纰抽吀閿傚拰纰抽吀閽＄殑鐗╄川鐨勯噺涔嬫瘮97...
绛旓細寰矑涓暟銆傛鏃跺鍙互鐢ㄥ崄瀛椾氦鍙夋硶姹傜畻娣峰悎鐗╁悇缁勫垎鍚噺銆鍗佸瓧浜ゅ弶娉曟暟瀛鎺ㄥ 锛氳鐪嬩笅闈袱涓吀鍨嬪叿浣撳疄渚嬶細 [ 渚 1]C 2 H 4 銆 C 3 H 4 娣峰悎姘斾綋骞冲潎鍒嗗瓙閲忎负 30 锛屾眰娣峰悎鐗╀腑涓ょ鐑冪殑浣撶Н姣斻 瑙ｏ細璁句袱绉嶆皵鎬佺儍鐗╄川鐨勯噺鍒嗗埆涓 n 1 銆 n 2 锛屾贩鍚堟皵浣撶殑璐ㄩ噺涓轰袱绉嶆皵浣撹川閲忎箣鍜屻
绛旓細瑙ｅ喅浜屾涓夐」寮廰x²+bx+c鐨勫洜寮忓垎瑙ｃ備妇渚嬶細2x²-5x-12=锛2x+3锛夛紙x-4锛夐氳繃瑙傚療锛屽彂鐜2x脳x=2x²灏辨槸棣栭」锛3脳锛-4)=-12灏辨槸鏈」锛2x脳锛-4锛+3脳x=-5x灏辨槸涓棿椤广傚嵆灏嗛椤圭殑2鍒嗚В涓2鍜1锛屾湯椤-12鍒嗚В涓3脳锛-4)浜ゅ弶鐩镐箻鍐嶇浉鍔狅紝灏辨槸涓棿椤广2 +3,1 ...
绛旓細鍍忚繖绉嶅熷姪鐢鍗佸瓧浜ゅ弶绾垮垎瑙ｇ郴鏁帮紝浠庤屽府鍔╂垜浠妸浜屾涓夐」寮忓垎瑙ｅ洜寮忕殑鏂规硶锛岄氬父 鍙仛鍗佸瓧鐩镐箻娉.渚2 鎶6x2锛7x锛5鍒嗚В鍥犲紡.鍒嗘瀽锛氭寜鐓т緥1鐨勬柟娉曪紝鍒嗚В浜屾椤圭郴鏁6鍙婂父鏁伴」锛5锛屾妸瀹冧滑鍒嗗埆鎺掑垪锛屽彲鏈8绉嶄笉鍚岀殑鎺掑垪鏂规硶锛屽叾涓殑涓绉 2 1 3 锛5 2脳(锛5)+3脳1=锛7 鏄纭殑锛...
绛旓細鏁板涓殑鍗佸瓧浜ゅ弶娉锛堝崄瀛楃浉涔樻硶锛夛細鍗佸瓧宸﹁竟鐩镐箻绛変簬浜屾椤圭郴鏁帮紝鍙宠竟鐩镐箻绛変簬甯告暟椤癸紝浜ゅ弶鐩镐箻鍐嶇浉鍔犵瓑浜庝竴娆￠」绯绘暟銆傚崄瀛楃浉涔娉曡兘鎶婃煇浜涗簩娆′笁椤瑰紡鍒嗚В鍥犲紡銆傝繖绉嶆柟娉曠殑鍏抽敭鏄妸浜屾椤圭郴鏁癮鍒嗚В鎴愪袱涓洜鏁癮1,a2鐨勭Нa1.a2锛屾妸甯告暟椤筩鍒嗚В鎴愪袱涓洜鏁癱1,c2鐨勭Нc1涔榗2锛屽苟浣縜1c2+a2c1姝ｅソ鏄竴娆￠」b...
绛旓細銆愬垎鏋愩戝彲灏嗙⒊閰搁挋鐨勫紡閲忕悊瑙ｄ负纰抽吀閿傚拰纰抽吀閽＄殑娣峰悎鐗╃殑骞冲潎寮忛噺锛屽埄鐢鍗佸瓧浜ゅ弶娉曡绠鍙緱纰抽吀閿傚拰纰抽吀閽＄殑鐗╄川鐨勯噺涔嬫瘮97:26 锛堜簲锛夋暟瀛︾粺璁 銆愪緥棰1銆戯紙2007骞村浗瀹跺叕鍔″憳鑰冭瘯棰橈級鏌愰珮鏍2006骞村害姣曚笟瀛︾敓7650鍚嶏紝姣斾笂骞村害澧為暱2% 銆傚叾涓湰绉戞瘯涓氱敓姣斾笂骞村害鍑忓皯2%銆傝岀爺绌剁敓姣曚笟鐢熸暟閲忔瘮涓婂勾搴﹀鍔10 ...
