Question

初一下册数学计算题要答案及过程

必须有一两步过程，不要方程，要因式分解等，不能有除号，重赏!!60道!

Answer 1

化简求值
^代表平方
1.已知|a+3|+(b-1)^=0,求3a^-2ab+b^的值。
2.已知(a-1)^+4(b+2)+|c+1|=0,求(a^-ac+c^)-2(a^+bc-2c^)的值。
3.(3x^-2y^-3xy)-(2x^-3y^+xy),其中x^+y^=2,xy=-1.
4.(-a^-ab+b^)-(-a^+2ab+b^),其中a=-1/15,b=10.
5.已知:|a+1/2|+(b-3)^=0,求代数式[(2a+b)^+(2a+b)(b-2a)-6b]\(2b)的值。
6.10a(5乘以a的平方-b)-2a(5b+25乘以a的平方)-3ab,其中a=1,b=1/23.
7.1/3x^3-2x^2+2/3x^3+3x^2+5x-4x+7,(x=2)
先化简,再求值.
8.5abc-{2a²b[3abc-(4ab²-a²b)]-2ab²}其中a=-2,b=3,c=-1/4.
9.已知a²+a-1=0,求代数式a³+2a²+5的值.
10.(a+2)的二次方-(a-1)(a+1),其中a=3.25
先化简再求值
11.(X-1)的二次方+(x+3)(x-3)+(x-3)(x-1),其中X的二次方-2x=2
12.已知:a+b=12,a的平方+b的平方=74
求ab的值
13.先化简,再求值
(4x-3y)的平方-(3x-2y)(3x+2y),其中x=2,y=1
14.化简求值:(1
+
a
-
5a)-(-
a
+2a
)，其中a=
-
3
15.已知3分之a=4分之b=5分之c，求代数式2b-a分之2a+b+c的值
16.(x-3)2+|y+2|=0则yx的值为(
)
17.设a,b,c为有理数,且|a|+a=0,|ab|=ab,|c|-c=0
求式子|b|-|a+b|-|c-b|+|a-c|的值
18.9x+6x^2-3(x-2/3x^2),其中x=-2
9x+6x^2-3x+11/3x^2=6x+29/3x^2=6*(-2)+29/3*(-2)=-12-58/3=-94/3
19.1/4(-4x^2+2x-8)-(1/2x-1),其中x=1/2
-x^2+1/2x-2-1/2x+1=-1/2^2+1/4-2-1/4+1=1/4-1=-3/4
20.(5a^2-3b^2)+(a^2+b^2)-(5a^2+3b^2),其中a=-1,b=1
5a^2-3b^2+a^2+b^2-5a^2-3b^2=5-3+1+1-5-3=-6+2=-4
21.2(a^2b+ab^2)-2(a^2b-1)-2ab^2-2,其中a=-2,b=2
2a^2*2b+2ab^2-2a^2*2b*2-2ab^2-2=8*4-22.4*4-2=-18
(x²-y²-2x+1)÷(x+y-1)
=[(x-1)²-y²]÷(x+y-1)
=(x+y-1)(x-y-1)÷(x+y-1)
=x-y-1
23.(x^4-2x²+1)÷(x²+2x+1)
=(x²-1)²÷(x+1)²
=(x+1)²(x-1)²÷(x+1)²
=(x-1)²
24.(a^4-16)÷(a-2)
=(a²+4)(a²-4)÷(a-2)
=(a²+4)(a+2)(a-2)÷(a-2)
=(a²+4)(a+2)
25.(a^2+b^2)²-4a^2b^2
=(a^2+b^2)²-(2ab)²
=(a²+b²+2ab)(a²+b²-2ab)
=(a+b)²(a-b)²
26.(-1)的2009次方+4=3
27.2005²-2004×2006
=2005^2-(2005-1)(2005+1)
=2005^2-2005^2+1
=1
1)(-9)-(-13)+(-20)+(-2)
(2)
3+13-(-7)/6
(3)
(-2)-8-14-13
(4)
(-7)*(-1)/7+8
(5)
(-11)*4-(-18)/18
(6)
4+(-11)-1/(-3)
(7)
(-17)-6-16/(-18)
(8)
5/7+(-1)-(-8)
(9)
(-1)*(-1)+15+1
(10)
3-(-5)*3/(-15)
(11)
6*(-14)-(-14)+(-13)
(12)
(-15)*(-13)-(-17)-(-4)
(13)
(-20)/13/(-7)+11
(14)
8+(-1)/7+(-4)
(15)
(-13)-(-9)*16*(-12)
(16)
(-1)+4*19+(-2)
(17)
(-17)*(-9)-20+(-6)
(18)
(-5)/12-(-16)*(-15)
(19)
(-3)-13*(-5)*13
(20)
5+(-7)+17-10
(21)
(-10)-(-16)-13*(-16)
(22)
(-14)+4-19-12
(23)
5*13/14/(-10)
(24)
3*1*17/(-10)
(25)
6+(-12)+15-(-15)
(26)
15/9/13+(-7)
(27)
2/(-10)*1-(-8)
(28)
11/(-19)+(-14)-5
(29)
19-16+18/(-11)
(30)
(-1)/19+(-5)+1
(31)
(-5)+19/10*(-5)
(32)
11/(-17)*(-13)*12
(33)
(-8)+(-10)/8*17
(34)
7-(-12)/(-1)+(-12)
(35)
12+12-19+20
(36)
(-13)*(-11)*20+(-4)
(37)
17/(-2)-2*(-19)
(38)
1-12*(-16)+(-9)
(39)
13*(-14)-15/20
(40)
(-15)*(-13)-6/(-9)
(41)
15*(-1)/12+7
(42)
(-13)+(-16)+(-14)-(-6)
(43)
14*12*(-20)*(-13)
(44)
17-9-20+(-10)
(45)
12/(-14)+(-14)+(-2)
(46)
(-15)-12/(-17)-(-3)
(47)
6-3/9/(-8)
(48)
(-20)*(-15)*10*(-4)
(49)
7/(-2)*(-3)/(-14)
(50)
13/2*18*(-7)
(51)
13*5+6+3
(52)
(-15)/5/3+(-20)
(53)
19*4+17-4
(54)
(-11)-(-6)*(-4)*(-9)
(55)
(-16)+16-(-8)*(-13)
(56)
16/(-1)/(-10)/(-20)
(57)
(-1)-(-9)-9/(-19)
(58)
13*20*(-13)*4
(59)
11*(-6)-3+18
(60)
(-20)+(-12)+(-1)+(-12)
(61)
(-19)-3*(-13)*4
1
-18
2
103/6
3
-37
4
9
5
-43
6
-(20/3)
7
-(199/9)
8
54/7
9
17
10
2
11
-83
12
216
13
1021/91
14
27/7
15
-1741
16
73
17
127
18
-(2885/12)
19
842
20
5
21
214
22
-41
23
-(13/28)
24
-(51/10)
25
24
26
-(268/39)
27
39/5
28
-(372/19)
29
15/11
30
-(77/19)
31
-(29/2)
32
1716/17
33
-(117/4)
34
-17
35
25
36
2856
37
59/2
38
184
39
-(731/4)
40
587/3
41
23/4
42
-37
43
43680
44
-22
45
-(118/7)
46
-(192/17)
47
145/24
48
-12000
49
-(3/4)
50
-819
51
74
52
-21
53
89
54
205
55
-104
56
-(2/25)
57
161/19
58
-13520
59
-51
60
-45
61
137
这些应该行了吧。