急求八年级上数学填空题+答案（50道） 初一上册数学题，急求，带答案啊~
\u6025\u6c42500\u9053\u5c0f\u5b66\u56db\u5e74\u7ea7\u6570\u5b66\u53e3\u7b97\u9898\uff0c\u5e26\u7b54\u6848\uff08\u4e0a\u5b66\u671f\uff09\u5c0f\u5b66\u56db\u5e74\u7ea7\u6570\u5b66\u53e3\u7b97\u9898\uff1a
1\u300145+15\u00d76= 135
2\u3001250\u00f75\u00d78=400
3\u30016\u00d75\u00f72\u00d74=60
4\u300130\u00d73+8=98
5\u3001400\u00f74+20\u00d75= 200
6\u300110+12\u00f73+20=34
7\u3001\uff0880\u00f720+80)\u00f74=21
8\u300170+(100-10\u00d75)=120
9\u3001360\u00f740= 9
10\u300140\u00d720= 800
11\u300180-25= 55
12\u300170+45=115
13\u300190\u00d72= 180
14\u300116\u00d76= 96
15\u3001300\u00d76= 1800
16\u3001540\u00f79=60
17\u300130\u00d720= 600
18\u3001400\u00f74= 100
19\u3001350-80= 270
20\u3001160+70=230
21\u300118-64\u00f78= 10
22\u300142\u00f76+20=27
23\u300140-5\u00d77= 5
24\u300180+60\u00f73=100
25\u300141+18\u00f72= 50
26\u300175-11\u00d75= 20
27\u300142+7-29= 20
28\u30015600\u00f780=70
29\u300125\u00d716= 400
30\u3001120\u00d725= 3000
31\u300136\u00d711= 396
32\u30011025\u00f725=41
33\u3001336+70= 406
34\u300125\u00d79\u00d74= 900
35\u3001200-33\u00d73= 101
36\u30013020-1010=2010
37\u300112\u00d750= 600
38\u300125\u00d78= 200
39\u300123\u00d711= 253
40\u3001125\u00f725=5
41\u30014200-2200=2000
42\u3001220+80= 300
43\u300120\u00d78\u00d75= 800
44\u3001600-3\u00d7200=0
45\u300120+20\u00f72= 30
46\u300135-25\u00f75= 30
47\u300136+8-40= 4
48\u30012800\u00f740=70
49\u300198\u00f714 = 7
50\u300196\u00f724 = 4
51\u300156\u00f714 =4
52\u300165\u00f713 = 5
53\u300175\u00f715 = 5
54\u3001120\u00f724 =5
55\u3001200\u00f725 = 8
56\u3001800\u00f716 = 50
57\u3001840\u00f721 =40
58\u3001560\u00f714 = 40
59\u3001390\u00f713 = 30
60\u3001600\u00f715 =40
61\u300172\u00f724 = 3
62\u300185\u00f717 = 5
63\u300190\u00f715 =6
64\u300196\u00f716 = 6
65\u300178\u00f726 = 4
66\u300151\u00f717 =3
67\u300180\u00f740 = 2
68\u3001100\u00f720 = 5
69\u3001100\u00f74 =25
70\u3001240\u00f740 = 6
71\u3001920\u00f74 = 230
72\u3001300\u00f760=5
73\u300164\u00f72 = 32
74\u300164\u00f74 = 16
75\u300150\u00f75 =10
76\u300160\u00f78 = 7\u30015
77\u300196\u00f74 = 24
78\u300190\u00f76 =15
79\u3001400+80 = 480
80\u3001400-80 = 320
81\u300140\u00d780 =3200
82\u3001400\u00f780 = 5
83\u300148\u00f716 = 3
84\u300196\u00f724 =4
85\u3001160\u00d75= 800
86\u30014\u00d7250= 1000
87\u30010\u00d7518= 0
88\u300110\u00d776= 760
89\u300136\u00d710=360
90\u300115\u00d76= 90
91\u300124\u00d73= 72
92\u30015\u00d718= 90
93\u300126\u00d74= 74
94\u30017\u00d715=105
95\u300132\u00d730= 960
96\u300140\u00d715= 600
97\u300160\u00d712= 720
98\u300123\u00d730= 690
99\u300130\u00d750=1500
100\u30010.5\u00d7700=350
\u53c2\u8003\u8d44\u6599\uff1ahttp://zhidao.baidu.com/link?url=k3uxX10GBYBmShrTp26iQXaJTBls4dtgqzSdWHR26QkC-IEi9mNu50RUyCjwJJJZ1IET6IlBUOCL6NNH5uZkr_
75\u00f7\u3014138\u00f7\uff08100-54\uff09\u3015 85\u00d7(95\uff0d1440\u00f724)
80400\uff0d(4300\uff0b870\u00f715) 240\u00d778\u00f7\uff08154-115\uff09
1437\u00d727\uff0b27\u00d7563 \u301475-\uff0812+18\uff09\u3015\u00f715
2160\u00f7\u3014\uff0883-79\uff09\u00d718\u3015 280\uff0b840\u00f724\u00d75
325\u00f713\u00d7(266\uff0d250) 85\u00d7(95\uff0d1440\u00f724)
58870\u00f7(105\uff0b20\u00d72) 1437\u00d727\uff0b27\u00d7563
81432\u00f7(13\u00d752\uff0b78) [37.85-\uff087.85+6.4\uff09] \u00d730
156\u00d7[(17.7-7.2)\u00f73] \uff08947\uff0d599\uff09\uff0b76\u00d764
36\u00d7(913\uff0d276\u00f723) [192\uff0d\uff0854\uff0b38\uff09]\u00d767
[\uff087.1-5.6\uff09\u00d70.9-1.15]\u00f72.5 81432\u00f7(13\u00d752\uff0b78)
5.4\u00f7[2.6\u00d7\uff083.7-2.9\uff09+0.62] \uff08947\uff0d599\uff09\uff0b76\u00d764 60\uff0d(9.5\uff0b28.9)]\u00f70.18 2.881\u00f70.43\uff0d0.24\u00d73.5 20\u00d7[(2.44\uff0d1.8)\u00f70.4\uff0b0.15] 28-(3.4 1.25\u00d72.4) 0.8\u00d7\u301415.5-(3.21 5.79)\u3015 \uff0831.8 3.2\u00d74\uff09\u00f75 194\uff0d64.8\u00f71.8\u00d70.9 36.72\u00f74.25\u00d79.9 3.416\u00f7\uff080.016\u00d735\uff09 0.8\u00d7[(10\uff0d6.76)\u00f71.2]
\uff08136+64\uff09\u00d7\uff0865-345\u00f723\uff09 (6.8-6.8\u00d70.55)\u00f78.5
0.12\u00d7 4.8\u00f70.12\u00d74.8 \uff0858+37\uff09\u00f7\uff0864-9\u00d75\uff09
812-700\u00f7\uff089+31\u00d711\uff09 \uff083.2\u00d71.5+2.5\uff09\u00f71.6
85+14\u00d7\uff0814+208\u00f726\uff09 120-36\u00d74\u00f718+35
\uff08284+16\uff09\u00d7\uff08512-8208\u00f718\uff09 9.72\u00d71.6-18.305\u00f77
4/7\u00f7[1/3\u00d7\uff083/5-3/10\uff09] \uff084/5+1/4\uff09\u00f77/3+7/10
12.78\uff0d0\u00f7\uff08 13.4\uff0b156.6 \uff09 37.812-700\u00f7\uff089+31\u00d711\uff09 \uff08136+64\uff09\u00d7\uff0865-345\u00f723\uff09 3.2\u00d7\uff081.5+2.5\uff09\u00f71.6
85+14\u00d7\uff0814+208\u00f726\uff09 \uff0858+37\uff09\u00f7\uff0864-9\u00d75\uff09
(6.8-6.8\u00d70.55)\u00f78.5 \uff08284+16\uff09\u00d7\uff08512-8208\u00f718\uff09
0.12\u00d7 4.8\u00f70.12\u00d74.8 \uff083.2\u00d71.5+2.5\uff09\u00f71.6
120-36\u00d74\u00f718+35 10.15-10.75\u00d70.4-5.7
5.8\u00d7\uff083.87-0.13\uff09+4.2\u00d73.74 347+45\u00d72-4160\u00f752
32.52-\uff086+9.728\u00f73.2\uff09\u00d72.5 87\uff0858+37\uff09\u00f7\uff0864-9\u00d75\uff09
[\uff087.1-5.6\uff09\u00d70.9-1.15] \u00f72.5 \uff083.2\u00d71.5+2.5\uff09\u00f71.6
5.4\u00f7[2.6\u00d7\uff083.7-2.9\uff09+0.62] 12\u00d76\u00f7\uff0812-7.2\uff09-6
3.2\u00d76+\uff081.5+2.5\uff09\u00f71.6 \uff083.2\u00d71.5+2.5\uff09\u00f71.6
5.8\u00d7\uff083.87-0.13\uff09+4.2\u00d73.74
33.02\uff0d\uff08148.4\uff0d90.85\uff09\u00f72.5
\u56de\u7b54\u8005\uff1a 754791551 - \u9b54\u6cd5\u5b66\u5f92 \u4e00\u7ea7 10-5 13:26
(\u4e00)\u8ba1\u7b97\u9898:
(1)23+(-73)
(2)(-84)+(-49)
(3)7+(-2.04)
(4)4.23+(-7.57)
(5)(-7/3)+(-7/6)
(6)9/4+(-3/2)
(7)3.75+(2.25)+5/4
(8)-3.75+(+5/4)+(-1.5)
(9)(-17/4)+(-10/3)+(+13/3)+(11/3)
(10)(-1.8)+(+0.2)+(-1.7)+(0.1)+(+1.8)+(+1.4)
(11)(+1.3)-(+17/7)
(12)(-2)-(+2/3)
(13)|(-7.2)-(-6.3)+(1.1)|
(14)|(-5/4)-(-3/4)|-|1-5/4-|-3/4|)
(15)(-2/199)*(-7/6-3/2+8/3)
(16)4a)*(-3b)*(5c)*1/6
\u8fd8\u670950\u9053\u9898\uff0c\u4e0d\u8fc7\u6ca1\u6709\u7b54\u6848
1. 3/7 \u00d7 49/9 - 4/3
2. 8/9 \u00d7 15/36 + 1/27
3. 12\u00d7 5/6 \u2013 2/9 \u00d73
4. 8\u00d7 5/4 + 1/4
5. 6\u00f7 3/8 \u2013 3/8 \u00f76
6. 4/7 \u00d7 5/9 + 3/7 \u00d7 5/9
7. 5/2 -\uff08 3/2 + 4/5 \uff09
8. 7/8 + \uff08 1/8 + 1/9 \uff09
9. 9 \u00d7 5/6 + 5/6
10. 3/4 \u00d7 8/9 - 1/3
0.12\u03c7\uff0b1.8\u00d70.9=7.2 (9\uff0d5\u03c7)\u00d70.3=1.02 6.4\u03c7-\u03c7=28+4.4
11. 7 \u00d7 5/49 + 3/14
12. 6 \u00d7\uff08 1/2 + 2/3 \uff09
13. 8 \u00d7 4/5 + 8 \u00d7 11/5
14. 31 \u00d7 5/6 \u2013 5/6
15. 9/7 - \uff08 2/7 \u2013 10/21 \uff09
16. 5/9 \u00d7 18 \u2013 14 \u00d7 2/7
17. 4/5 \u00d7 25/16 + 2/3 \u00d7 3/4
18. 14 \u00d7 8/7 \u2013 5/6 \u00d7 12/15
19. 17/32 \u2013 3/4 \u00d7 9/24
20. 3 \u00d7 2/9 + 1/3
21. 5/7 \u00d7 3/25 + 3/7
22. 3/14 \u00d7\u00d7 2/3 + 1/6
23. 1/5 \u00d7 2/3 + 5/6
24. 9/22 + 1/11 \u00f7 1/2
25. 5/3 \u00d7 11/5 + 4/3
26. 45 \u00d7 2/3 + 1/3 \u00d7 15
27. 7/19 + 12/19 \u00d7 5/6
28. 1/4 + 3/4 \u00f7 2/3
29. 8/7 \u00d7 21/16 + 1/2
30. 101 \u00d7 1/5 \u2013 1/5 \u00d7 21
31.50\uff0b160\u00f740 \uff0858+370\uff09\u00f7\uff0864-45\uff09
32.120-144\u00f718+35
33.347+45\u00d72-4160\u00f752
34\uff0858+37\uff09\u00f7\uff0864-9\u00d75\uff09
35.95\u00f7\uff0864-45\uff09
36.178-145\u00f75\u00d76+42 420+580-64\u00d721\u00f728
37.812-700\u00f7\uff089+31\u00d711\uff09 \uff08136+64\uff09\u00d7\uff0865-345\u00f723\uff09
38.85+14\u00d7\uff0814+208\u00f726\uff09
39.\uff08284+16\uff09\u00d7\uff08512-8208\u00f718\uff09
40.120-36\u00d74\u00f718+35
41.\uff0858+37\uff09\u00f7\uff0864-9\u00d75\uff09
42.(6.8-6.8\u00d70.55)\u00f78.5
43.0.12\u00d7 4.8\u00f70.12\u00d74.8
44.\uff083.2\u00d71.5+2.5\uff09\u00f71.6 \uff082\uff093.2\u00d7\uff081.5+2.5\uff09\u00f71.6
45.6-1.6\u00f74= 5.38+7.85-5.37=
46.7.2\u00f70.8-1.2\u00d75= 6-1.19\u00d73-0.43=
47.6.5\u00d7\uff084.8-1.2\u00d74\uff09= 0.68\u00d71.9+0.32\u00d71.9
48.10.15-10.75\u00d70.4-5.7
49.5.8\u00d7\uff083.87-0.13\uff09+4.2\u00d73.74
50.32.52-\uff086+9.728\u00f73.2\uff09\u00d72.5
51.-5+58+13+90+78-(-56)+50
52.-7*2-57/(3
53.(-7)*2/(1/3)+79/(3+6/4\uff09
54.123+456+789+98/(-4)
55.369/33-(-54-31/15.5)
56.39+{3x[42/2x(3x8)]}
57.9x8x7/5x(4+6)
58.11x22/(4+12/2)
59.94+(-60)/10
1.
a^3-2b^3+ab(2a-b)
=a^3+2a^2b-2b^3-ab^2
=a^2(a+2b)-b^2(2b+a)
=(a+2b)(a^2-b^2)
=(a+2b)(a+b)(a-b)
2.
(x^2+y^2)^2-4y(x^2+y^2)+4y^2
=(x^2+y^2-2y)^2
3.
(x^2+2x)^2+3(x^2+2x)+x^2+2x+3
=(x^2+2x)^2+4(x^2+2x)+3
=(x^2+2x+3)(x^2+2x+1)
=(x^2+2x+3)(x+1)^2
4.
(a+1)(a+2)+(2a+1)(a-2)-12
=a^2+3a+2+2a^2-3a-2-12
=3a^2-12
=3(a+2)(a-2)
5.
x^2(y+z)^2-2xy(x-z)(y+z)+y^2(x-z)^2
=[x(y+z)-y(x-z)]^2
=(xz+yz)^2
=z^2(x+y)^2
6.
3(a+2)^2+28(a+2)-20
=[3(a+2)-2][(a+2)+10]
=(3a+4)(a+12)
7.
(a+b)^2-(b-c)^2+a^2-c^2
=(a+b)^2-c^2+a^2-(b-c)^2
=(a+b+c)(a+b-c)+(a+b-c)(a-b+c)
=(a+b-c)(a+b+c+a-b+c)
=2(a+b-c)(a+c)
8.
x(x+1)(x^2+x-1)-2
=(x^2+x)(x^2+x-1)-2
=(x^2+x)^2-(x^2+x)-2
=(x^2+x-2)(x^2+x+1)
=(x+2)(x-1)(x^2+x+1)
(\u4e8c)\u586b\u7a7a\u9898:
(1)\u96f6\u51cf\u53bba\u7684\u76f8\u53cd\u6570,\u5176\u7ed3\u679c\u662f_____________; (2)\u82e5a-b>a,\u5219b\u662f_____________\u6570; (3)\u4ece-3.14\u4e2d\u51cf\u53bb-\u03c0,\u5176\u5dee\u5e94\u4e3a____________; (4)\u88ab\u51cf\u6570\u662f-12(4/5),\u5dee\u662f4.2,\u5219\u51cf\u6570\u5e94\u662f_____________; (5)\u82e5b-a<-,\u5219a,b\u7684\u5173\u7cfb\u662f___________,\u82e5a-b<0,\u5219a,b\u7684\u5173\u7cfb\u662f______________; (6)(+22/3)-( )=-7
(\u4e09)\u5224\u65ad\u9898:
(1)\u4e00\u4e2a\u6570\u51cf\u53bb\u4e00\u4e2a\u8d1f\u6570,\u5dee\u6bd4\u88ab\u51cf\u6570\u5c0f. (2)\u4e00\u4e2a\u6570\u51cf\u53bb\u4e00\u4e2a\u6b63\u6570,\u5dee\u6bd4\u88ab\u51cf\u6570\u5c0f. (3)0\u51cf\u53bb\u4efb\u4f55\u6570,\u6240\u5f97\u7684\u5dee\u603b\u7b49\u4e8e\u8fd9\u4e2a\u6570\u7684\u76f8\u53cd\u6570. (4)\u82e5X+(-Y)=Z,\u5219X=Y+Z (5)\u82e5a0
\u4e00)\u9009\u62e9\u9898:
(1)\u5df2\u77e5a,b\u662f\u4e24\u4e2a\u6709\u7406\u6570,\u5982\u679c\u5b83\u4eec\u7684\u5546a/b=0,\u90a3\u4e48( ) (A)a=0\u4e14b\u22600 (B)a=0 (C)a=0\u6216b=0 (D)a=0\u6216b\u22600 (2)\u4e0b\u5217\u7ed9\u5b9a\u56db\u7ec4\u65701\u548c1;-1\u548c-1;0\u548c0;-2/3\u548c-3/2,\u5176\u4e2d\u4e92\u4e3a\u5012\u6570\u7684\u662f( ) (A)\u53ea\u6709 (B)\u53ea\u6709 (C)\u53ea\u6709 (D)\u90fd\u662f (3)\u5982\u679ca/|b|(b\u22600)\u662f\u6b63\u6574\u6570,\u5219( ) (A)|b|\u662fa\u7684\u7ea6\u6570 (B)|b|\u662fa\u7684\u500d\u6570 (C)a\u4e0eb\u540c\u53f7 (D)a\u4e0eb\u5f02\u53f7 (4)\u5982\u679ca>b,\u90a3\u4e48\u4e00\u5b9a\u6709( ) (A)a+b>a (B)a-b>a (C)2a>ab (D)a/b>1
(\u4e8c)\u586b\u7a7a\u9898:
(1)\u5f53|a|/a=1\u65f6,a______________0;\u5f53|a|/a=-1\u65f6,a______________0;(\u586b>,0,\u5219a___________0; (11)\u82e5ab/c0,\u5219b___________0; (12)\u82e5a/b>0,b/c(-0.3)4>-106 (B)(-0.3)4>-106>(-0.2)3 (C)-106>(-0.2)3>(-0.3)4 (D)(-0.3)4>(-0.2)3>-106 (4)\u82e5a\u4e3a\u6709\u7406\u6570,\u4e14a2>a,\u5219a\u7684\u53d6\u503c\u8303\u56f4\u662f( ) (A)a1\u6216a<0 (5)\u4e0b\u9762\u7528\u79d1\u5b66\u8bb0\u6570\u6cd5\u8868\u793a106000,\u5176\u4e2d\u6b63\u786e\u7684\u662f( ) (A)1.06*105 (B)10.6*105 (C)1.06*106 (D)0.106*107 (6)\u5df2\u77e51.2363=1.888,\u5219123.63\u7b49\u4e8e( ) (A)1888 (B)18880 (C)188800 (D)1888000 (7)\u82e5a\u662f\u6709\u7406\u6570,\u4e0b\u5217\u5404\u5f0f\u603b\u80fd\u6210\u7acb\u7684\u662f( ) (A)(-a)4=a4 (B)(-a)3=A4 (C)-a4=(-a)4 (D)-a3=a3 (8)\u8ba1\u7b97:(-1)1-(-2)2-(-3)3-(-4)4\u6240\u5f97\u7ed3\u679c\u662f( ) (A)288 (B)-288 (C)-234 (D)280
(\u4e8c)\u586b\u7a7a\u9898:
(1)\u572823\u4e2d,3\u662f________,2\u662f_______,\u5e42\u662f________;\u82e5\u628a3\u770b\u4f5c\u5e42,\u5219\u5b83\u7684\u5e95\u6570\u662f________,
\u6307\u6570\u662f________; (2)\u6839\u636e\u5e42\u7684\u610f\u4e49:(-2)3\u8868\u793a________\u76f8\u4e58; (-3)2v\u8868\u793a________\u76f8\u4e58;-23\u8868\u793a________. (3)\u5e73\u65b9\u7b49\u4e8e36/49\u7684\u6709\u7406\u6570\u662f________;\u7acb\u65b9\u7b49\u4e8e-27/64\u7684\u6570\u662f________ (4)\u628a\u4e00\u4e2a\u5927\u4e8e10\u7684\u6b63\u6570\u8bb0\u6210a*10n(n\u4e3a\u6b63\u6574\u6570)\u7684\u5f62\u6210,a\u7684\u8303\u56f4\u662f________,\u8fd9\u91ccn\u6bd4\u539f\u6765\u7684\u6574
\u6570\u4f4d\u6570\u5c11_________,\u8fd9\u79cd\u8bb0\u6570\u6cd5\u79f0\u4e3a\u79d1\u5b66\u8bb0\u6570\u6cd5; (5)\u7528\u79d1\u5b66\u8bb0\u6570\u6cd5\u8bb0\u51fa\u4e0b\u9762\u5404\u6570:4000=___________;950000=________________;\u5730\u7403
\u7684\u8d28\u91cf\u7ea6\u4e3a49800...0\u514b(28\u4f4d),\u53ef\u8bb0\u4e3a________; (6)\u4e0b\u9762\u7528\u79d1\u5b66\u8bb0\u6570\u6cd5\u8bb0\u51fa\u7684\u6570,\u539f\u6765\u5404\u4e3a\u591a\u5c11 105=_____________;2*105=______________; 9.7*107=______________9.756*103=_____________ (7)\u4e0b\u5217\u5404\u6570\u5206\u522b\u662f\u51e0\u4f4d\u81ea\u7136\u6570 7*106\u662f______\u4f4d\u6570 1.1*109\u662f________\u4f4d\u6570; 3.78*107\u662f______\u4f4d\u6570 1010\u662f________\u4f4d\u6570; (8)\u82e5\u6709\u7406\u6570m 0,b0 (B)a-|b|>0 (C)a2+b3>0 (D)a0 (C)a,b\u4e92\u4e3a\u76f8\u53cd\u6570; (D)-ab (C)a
(5)\u7528\u56db\u820d\u4e94\u5165\u6cd5\u5f97\u5230\u7684\u8fd1\u4f3c\u65701.20\u6240\u8868\u793a\u7684\u51c6\u786e\u6570a\u7684\u8303\u56f4\u662f( )
(A)1.195\u2264a<1.205 (B)1.15\u2264a<1.18 (C)1.10\u2264a<1.30 (D)1.200\u2264a<1.205 (6)\u4e0b\u5217\u8bf4\u6cd5\u6b63\u786e\u7684\u662f( ) (A)\u8fd1\u4f3c\u65703.80\u7684\u7cbe\u786e\u5ea6\u4e0e\u8fd1\u4f3c\u657038\u7684\u7cbe\u786e\u5ea6\u76f8\u540c; (B)\u8fd1\u4f3c\u657038.0\u4e0e\u8fd1\u4f3c\u657038\u7684\u6709\u6548\u6570\u5b57\u4e2a\u6570\u4e00\u6837 (C)3.1416\u7cbe\u786e\u5230\u767e\u5206\u4f4d\u540e,\u6709\u4e09\u4e2a\u6709\u6548\u6570\u5b573,1,4; (D)\u628a123*102\u8bb0\u62101.23*104,\u5176\u6709\u6548\u6570\u5b57\u6709\u56db\u4e2a.
(\u4e8c)\u586b\u7a7a\u9898:
(1)\u5199\u51fa\u4e0b\u5217\u7531\u56db\u820d\u4e94\u5165\u5f97\u5230\u7684\u8fd1\u4f3c\u503c\u6570\u7684\u7cbe\u786e\u5ea6\u4e0e\u6709\u6548\u6570\u5b57: (1)\u8fd1\u4f3c\u657085\u7cbe\u786e\u5230________\u4f4d,\u6709\u6548\u6570\u5b57\u662f________; (2)\u8fd1\u4f3c\u65703\u4e07\u7cbe\u786e\u5230______\u4f4d,\u6709\u6548\u6570\u5b57\u662f________; (3)\u8fd1\u4f3c\u65705200\u5343\u7cbe\u786e\u5230________,\u6709\u6548\u6570\u5b57\u662f_________; (4)\u8fd1\u4f3c\u65700.20\u7cbe\u786e\u5230_________\u4f4d,\u6709\u6548\u6570\u5b57\u662f_____________. (2)\u8bbee=2.71828......,\u53d6\u8fd1\u4f3c\u65702.7\u662f\u7cbe\u786e\u5230__________\u4f4d,\u6709_______\u4e2a\u6709\u6548\u6570\u5b57;
\u53d6\u8fd1\u4f3c\u65702.7183\u662f\u7cbe\u786e\u5230_________\u4f4d,\u6709_______\u4e2a\u6709\u6548\u6570\u5b57. (3)\u7531\u56db\u820d\u4e94\u5165\u5f97\u5230\u03c0=3.1416,\u7cbe\u786e\u52300.001\u7684\u8fd1\u4f3c\u503c\u662f\u03c0=__________; (4)3.1416\u4fdd\u7559\u4e09\u4e2a\u6709\u6548\u6570\u5b57\u7684\u8fd1\u4f3c\u503c\u662f_____________;
(\u4e09)\u5224\u65ad\u9898:
(1)\u8fd1\u4f3c\u657025.0\u7cbe\u786e\u4ee5\u4e2a\u75ca,\u6709\u6548\u6570\u5b57\u662f2,5; (2)\u8fd1\u4f3c\u65704\u5343\u548c\u8fd1\u4f3c\u65704000\u7684\u7cbe\u786e\u7a0b\u5ea6\u4e00\u6837; (3)\u8fd1\u4f3c\u65704\u5343\u548c\u8fd1\u4f3c\u65704*10^3\u7684\u7cbe\u786e\u7a0b\u5ea6\u4e00\u6837; (4)9.949\u7cbe\u786e\u52300.01\u7684\u8fd1\u4f3c\u6570\u662f9.95.
\u7ec3\u4e60\u516b(B\u7ea7)
(\u4e00)\u7528\u56db\u820d\u4e94\u5165\u6cd5\u5bf9\u4e0b\u5217\u5404\u6570\u53d6\u8fd1\u4f3c\u503c(\u8981\u6c42\u4fdd\u7559\u4e09\u4e2a\u6709\u6548\u6570\u5b57): (1)37.27 (2)810.9 (3)0.0045078 (4)3.079
(\u4e8c)\u7528\u56db\u820d\u4e94\u5165\u6cd5\u5bf9\u4e0b\u5217\u5404\u6570\u53d6\u8fd1\u4f3c\u503c(\u8981\u6c42\u7cbe\u786e\u5230\u5343\u4f4d): (1)37890.6 (2)213612.4 (3)1906.57
9.
9x^2(x-1)^2-3(x^2-x)-56
=9x^2(x-1)^2-3x(x-1)-56
=[3x(x-1)-8][3x(x-1)+7]
=(3x^2-3x-8)(3x^2-3x+7
\u671b\u91c7\u7eb3\uff0c\u8c22\u8c22\uff01
若(x+2)2=(x+3)(x-3)则x=_____________
.
等腰三角形的顶角为400,则底角的度数为_____________
已知点P1(a-1,5)和P2(2,b-1)关于x轴对称,则(a+b)2005的值为____________
已知△ABC是边长为4的等边三角形,P为AB上一动点PQ⊥BC于Q,设AP=x,CQ=y,则y与x之间的函数关系式为_____________.
已知P(x1,y1),Q(x2,y2)是直线y=(2m+1)x+m上两点且当x1
y2,则m的取值范围是________
从A地向B地打长途电话,3min内收费2.4元,超过3min后每增加1min加收1元(不足1min按1min计算),写出
电话费y(元)与通话时间t(t>3)(min)之间的函数关系式
等腰三角形的底边长是5cm,一条中线把三角形分成两部分,其周长之差为_________
答案补充
1.在Rt△ABC中,∠C=90°,①若a=5,b=12,则c=____;②若a=15,c=25,则b=___;③若c=61,b=60,则a=_____;④若a:b=3:4,c=10则SRt△ABC=____.
2.在△ABC中,AC=17
cm,BC=
10
cm,AB=9
cm,这是一个
三角形(按角分).
3..直角三角形两直角边长分别为5和12,则它斜边上的高为______.
4.在平静的湖面上,有一支红莲,高出水面1米,阵风吹来,红莲被吹到一边,花朵齐及水面,已知红莲移动的水平距离为2米,问这里水深是________m.
5.已知两条线段的长为5cm和12cm,当第三条线段的长为
cm时,这三条线段能组成一个直角三角形.
6.有一个长为12
cm,宽为4
cm,高为3
cm的长方体形铁盒,在其内部要放一根笔直的铁丝,则铁丝最长达到
cm.
7.在一棵树的10米高处有两只猴子,一只猴子爬下树走到离树20米处的池塘的A处.另一只爬到树顶D后直接跃到A处,距离以直线计算,如果两只猴子所经过的距离相等,则这棵树高_________米.
答案补充
1.
13
20
11
24
2.
钝角三角形
3.
13
4.
1.5米
5.
13或
根号119
6.13
7.15
8.一个三角形三条边的比为5:12:13,且周长为60cm,求它的面积.
解:三角形的三边的长分别为:
60×=10厘米
60×=24厘米
60×=26厘米
∵102+242=676=262
∴此三角形是直角三角形.
∴S=
×10×24=120厘米2
9.小明想知道学校旗杆的高,他发现旗杆顶端的绳子垂到地面还多1米,当他把绳子的下端拉开5米后,发现下端刚好接触地面,求旗杆的高度.
解:设旗杆的高度是x米,由已知可知绳子的长度是(x+1)米,根据勾股定理可得:
x2+52=(x+1)2
解得:x=12
所以,旗杆的高度为12米.
答案补充
已知一次函数图象经过(3,5)和(-4,-9)两点,(1)求此函数解析式.(2),若点(a,2)在些函数图象上,求a的值.
(1).y=2x-1
(2),a=3/2
若三角形的三边a,b,c满足++(c-10)2=0试判断三角形是否是直角三角形
若是,试说明理由.
23.a=8,b=6,c=10所以是直角三角形
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