求80道初一下学期数学化简题,40道化简求值题
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求80道初一下学期数学化简题,40道化简求值题
求80道初一下学期数学化简题,40道化简求值题
求80道初一下学期数学化简题,40道化简求值题
在这两个地方看看.
1.(2x立方-xyz)-2(x立方-y立方+xyz)+xyz-2y立方。其中x=1,y=2,z=-3
2.5abc-{2的平方b-[3abc-(4ab平方-a的平方b)]}
3.3ab-4ab+8ab-7ab+ab=______.
4.7x-(5x-5y)-y=______.
5.23a3bc2-15ab2c+8abc-24a3bc2-8abc=______...
全部展开
1.(2x立方-xyz)-2(x立方-y立方+xyz)+xyz-2y立方。其中x=1,y=2,z=-3
2.5abc-{2的平方b-[3abc-(4ab平方-a的平方b)]}
3.3ab-4ab+8ab-7ab+ab=______.
4.7x-(5x-5y)-y=______.
5.23a3bc2-15ab2c+8abc-24a3bc2-8abc=______.
6.-7x2+6x+13x2-4x-5x2=______.
7.2y+(-2y+5)-(3y+2)=______.
11.(2x2-3xy+4y2)+(x2+2xy-3y2)=______.
12.2a-(3a-2b+2)+(3a-4b-1)=______.
13.-6x2-7x2+15x2-2x2=______.
14.2x-(x+3y)-(-x-y)-(x-y)=______.
16.2x+2y-[3x-2(x-y)]=______.
17.5-(1-x)-1-(x-1)=______.
18.( )+(4xy+7x2-y2)=10x2-xy.
19.(4xy2-2x2y)-( )=x3-2x2y+4xy2+y3.
21.已知A=x3-2x2+x-4,B=2x3-5x+3,计算A+B=______.
22.已知A=x3-2x2+x-4,B=2x3-5x+3,计算A-B=______.
23.若a=-0.2,b=0.5,代数式-(|a2b|-|ab2|)的值为______.
25.一个多项式减去3m4-m3-2m+5得-2m4-3m3-2m2-1,那么这个多项式等于______.
26.-(2x2-y2)-[2y2-(x2+2xy)]=______.
27.若-3a3b2与5ax-1by+2是同类项,则x=______,y=______.
28.(-y+6+3y4-y3)-(2y2-3y3+y4-7)=______.
29.化简代数式4x2-[7x2-5x-3(1-2x+x2)]的结果是______.
30.2a-b2+c-d3=2a+( )-d3=2a-d3-( )=c-( ).
31.3a-(2a-3b)+3(a-2b)-b=______.
32.化简代数式x-[y-2x-(x+y)]等于______.
33.[5a2+( )a-7]+[( )a2-4a+( )]=a2+2a+1.
34.3x-[y-(2x+y)]=______.
35.化简|1-x+y|-|x-y|(其中x<0,y>0)等于______.
36.已知x≤y,x+y-|x-y|=______.
37.已知x<0,y<0,化简|x+y|-|5-x-y|=______.
38.4a2n-an-(3an-2a2n)=______.
39.若一个多项式加上-3x2y+2x2-3xy-4得
2x2y+3xy2-x2+2xy,
则这个多项式为______.
40.-5xm-xm-(-7xm)+(-3xm)=______.
41.当a=-1,b=-2时,
[a-(b-c)]-[-b-(-c-a)]=______.
43.当a=-1,b=1,c=-1时,
-[b-2(-5a)]-(-3b+5c)=______.
44.-2(3x+z)-(-6x)+(-5y+3z)=______.
45.-5an-an+1-(-7an+1)+(-3an)=______.
46.3a-(2a-4b-6c)+3(-2c+2b)=______.
48.9a2+[7a2-2a-(-a2+3a)]=______.
50.当2y-x=5时,5(x-2y)2-3(-x+2y)-100=______.
(二)选择
[ ]
A.2;
B.-2;
C.-10;
D.-6.
52.下列各式中计算结果为-7x-5x2+6x3的是 [ ]
A.3x-(5x2+6x3-10x);
B.3x-(5x2+6x3+10x);
C.3x-(5x2-6x3+10x);
D.3x-(5x2-6x3-10x).
53.把(-x-y)+3(x+y)-5(x+y)合并同类项得 [ ]
A.(x-y)-2(x+y);
B.-3(x+y);
C.(-x-y)-2(x+y);
D.3(x+y).
54.2a-[3b-5a-(2a-7b)]等于 [ ]
A.-7a+10b;
B.5a+4b;
C.-a-4b;
D.9a-10b.
55.减去-3m等于5m2-3m-5的代数式是 [ ]
A.5(m2-1);
B.5m2-6m-5;
C.5(m2+1);
D.-(5m2+6m-5).
56.将多项式2ab-9a2-5ab-4a2中的同类项分别结合在一起,应为 [ ]
A.(9a2-4a2)+(-2ab-5ab);
B.(9a2+4a2)-(2ab-5ab);
C.(9a2-4a2)-(2ab+5ab);
D.(9a2-4a2)+(2ab-5ab).
57.当a=2,b=1时,-a2b+3ba2-(-2a2b)等于 [ ]
A.20;
B.24;
C.0;
D.16.
中,正确的选择是 [ ]
A.没有同类项;
B.(2)与(4)是同类项;
C.(2)与(5)是同类项;
D.(2)与(4)不是同类项.
59.若A和B均为五次多项式,则A-B一定是 [ ]
A.十次多项式;
B.零次多项式;
C.次数不高于五次的多项式;
D.次数低于五次的多项式.
60.-{[-(x+y)]}+{-[(x+y)]}等于 [ ]
A.0;
B.-2y;
C.x+y;
D.-2x-2y.
61.若A=3x2-5x+2,B=3x2-5x+6,则A与B的大小是
[ ]
A.A>B;
B.A=B;
C.A<B;
D.无法确定.
62.当m=-1时,-2m2-[-4m2+(-m2)]等于 [ ]
A.-7;
B.3;
C.1;
D.2.
63.当m=2,n=1时,多项式-m-[-(2m-3n)]+[-(-3m)-4n]等于 [ ]
A.1;
B.9;
C.3;
D.5.
[ ]
65.-5an-an-(-7an)+(-3an)等于 [ ]
A.-16an;
B.-16;
C.-2an;
D.-2.
66.(5a-3b)-3(a2-2b)等于 [ ]
A.3a2+5a+3b;
B.2a2+3b;
C.2a3-b2;
D.-3a2+5a-5b.
67.x3-5x2-4x+9等于 [ ]
A.(x3-5x2)-(-4x+9);
B.x3-5x2-(4x+9);
C.-(-x3+5x2)-(4x-9);
D.x3+9-(5x2-4x).
[ ]
69.4x2y-5xy2的结果应为 [ ]
A.-x2y;
B.-1;
C.-x2y2;
D.以上答案都不对.
(三)化简
70.(4x2-8x+5)-(x3+3x2-6x+2).
72.(0.3x3-x2y+xy2-y3)-(-0.5x3-x2y+0.3xy2).
73.-{2a2b-[3abc-(4ab2-a2b)]}.
74.(5a2b+3a2b2-ab2)-(-2ab2+3a2b2+a2b).
75.(x2-2y2-z2)-(-y2+3x2-z2)+(5x2-y2+2z2).
76.(3a6-a4+2a5-4a3-1)-(2-a+a3-a5-a4).
77.(4a-2b-c)-5a-[8b-2c-(a+b)].
78.(2m-3n)-(3m-2n)+(5n+m).
79.(3a2-4ab-5b2)-(2b2-5a2+2ab)-(-6ab).
80.xy-(2xy-3z)+(3xy-4z).
81.(-3x3+2x2-5x+1)-(5-6x-x2+x3).
83.3x-(2x-4y-6x)+3(-2z+2y).
84.(-x2+4+3x4-x3)-(x2+2x-x4-5).
85.若A=5a2-2ab+3b2,B=-2b2+3ab-a2,计算A+B.
86.已知A=3a2-5a-12,B=2a2+3a-4,求2(A-B).
87.2m-{-3n+[-4m-(3m-n)]}.
88.5m2n+(-2m2n)+2mn2-(+m2n).
89.4(x-y+z)-2(x+y-z)-3(-x-y-z).
90.2(x2-2xy+y2-3)+(-x2+y2)-(x2+2xy+y2).
92.2(a2-ab-b2)-3(4a-2b)+2(7a2-4ab+b2).
94.4x-2(x-3)-3[x-3(4-2x)+8].
(四)将下列各式先化简,再求值
97.已知a+b=2,a-b=-1,求3(a+b)2(a-b)2-5(a+b)2×(a-b)2的值.
98.已知A=a2+2b2-3c2,B=-b2-2c2+3a2,C=c2+2a2-3b2,求(A-B)+C.
99.求(3x2y-2xy2)-(xy2-2x2y),其中x=-1,y=2.
101.已知|x+1|+(y-2)2=0,求代数式5(2x-y)-3(x-4y)的值.
102.(x^2/x)-y-x-y
103.-2n-(3n-1)
104.(a/a-b)-(a/a+b)-(2b^2/a^2-b^2)
105.a-(5a-3b)+(2b-a)
106.-3(2s-5)+6s
107.(2x-xy)-(x+xy-6)
108..(x-2y+3z)(x+2y-3z)
109.2x^2+2x+1/2
110.4x^y^-(x^2+y^)^2
111.5m^2(a-b)^3-10m(b-a)^2
112.三角形ABC的3边是a、b、c并且-c^2+a^2+2ab-2ab=0请你说明三角形ABC是等腰三角形
113.1-(2a-1)-(3a+3)
114.3(-ab+2a)-(3a-b)
115.14(abc-2a)+3(6a-2abc)
116.3(xy-2z)+(-xy+3z)
117.-4(pq+pr)+(4pq+pr)
118.6a的2平方-5a(a+2b-q)+a(-a+10b)+5
其中,a=-1
b=2008
119.6xy-[(2x²+5xy-3y²)-(x²-3xy+y²)]其中x=-1/2,y=-1/4
120.x^+(5x^-xy)-2(x^-3xy)其中x=-2分之1,y=-1
收起
3ab-4ab+8ab-7ab+ab=______.
7x-(5x-5y)-y=______.
23a3bc2-15ab2c+8abc-24a3bc2-8abc=______.
-7x2+6x+13x2-4x-5x2=______.
2y+(-2y+5)-(3y+2)=______.
(2x2-3xy+4y2)+(x2+2xy-3y2)=_____...
全部展开
3ab-4ab+8ab-7ab+ab=______.
7x-(5x-5y)-y=______.
23a3bc2-15ab2c+8abc-24a3bc2-8abc=______.
-7x2+6x+13x2-4x-5x2=______.
2y+(-2y+5)-(3y+2)=______.
(2x2-3xy+4y2)+(x2+2xy-3y2)=______.
2a-(3a-2b+2)+(3a-4b-1)=______.
-6x2-7x2+15x2-2x2=_____.
2x-(x+3y)-(-x-y)-(x-y)=______.
2x+2y-[3x-2(x-y)]=______.
5-(1-x)-1-(x-1)=______.
( )+(4xy+7x2-y2)=10x2-xy .
(4xy2-2x2y)-( )=x3-2x2y+4xy2+y3.
(4x2-8x+5)-(x3+3x2-6x+2).
(0.3x3-x2y+xy2-y3)-(-0.5x3-x2y+0.3xy2).
-{2a2b-[3abc-(4ab2-a2b)]}.
(5a2b+3a2b2-ab2)-(-2ab2+3a2b2+a2b).
(x2-2y2-z2)-(-y2+3x2-z2)+(5x2-y2+2z2).
(3a6-a4+2a5-4a3-1)-(2-a+a3-a5-a4).
(4a-2b-c)-5a-[8b-2c-(a+b)].
(2m-3n)-(3m-2n)+(5n+m).
(3a2-4ab-5b2)-(2b2-5a2+2ab)-(-6ab).
xy-(2xy-3z)+(3xy-4z).
(-3x3+2x2-5x+1)-(5-6x-x2+x3).
3x-(2x-4y-6x)+3(-2z+2y).
(-x2+4+3x4-x3)-(x2+2x-x4-5).
若A=5a2-2ab+3b2,B=-2b2+3ab-a2,计算A+B.
已知A=3a2-5a-12,B=2a2+3a-4,求2(A-B).
2m-{-3n+[-4m-(3m-n)]}.
5m2n+(-2m2n)+2mn2-(+m2n).
4(x-y+z)-2(x+y-z)-3(-x-y-z).
2(x2-2xy+y2-3)+(-x2+y2)-(x2+2xy+y2).
2(a2-ab-b2)-3(4a-2b)+2(7a2-4ab+b2).
97.已知a+b=2,a-b=-1,求3(a+b)2(a-b)2-5(a+b)2×(a-b)2的值.
98.已知A=a2+2b2-3c2,B=-b2-2c2+3a2,C=c2+2a2-3b2,求(A-B)+C.
99.求(3x2y-2xy2)-(xy2-2x2y),其中x=-1,y=2.
101.已知|x+1|+(y-2)2=0,求代数式5(2x-y)-3(x-4y)的值
当m=2,n=1时,多项式-m-[-(2m-3n)]+[-(-3m)-4n]等于
当m=-1时,-2m2-[-4m2+(-m2)]等于
若A=3x2-5x+2,B=3x2-5x+6,则A与B的大小
当a=2,b=1时,-a2b+3ba2-(-2a2b)等于
减去-3m等于5m2-3m-5的代数式是
|1-x+y|-|x-y|(其中x<0,y>0)等于
代数式x-[y-2x-(x+y)]等于
已知x≤y,x+y-|x-y|
已知x<0,y<0,化简|x+y|-|5-x-y|
若一个多项式加上-3x2y+2x2-3xy-4得2x2y+3xy2-x2+2xy, 则这个多项式为
已知A=x3-2x2+x-4,B=2x3-5x+3,计算A+B
已知A=x3-2x2+x-4,B=2x3-5x+3,计算A-B
若a=-0.2,b=0.5,代数式-(|a2b|-|ab2|)的值为
一个多项式减去3m4-m3-2m+5得-2m4-3m3-2m2-1,那么这个多项式等于
若-3a3b2与5ax-1by+2是同类项,则x=______,y=______.
当a=-1,b=-2时[a-(b-c)]-[-b-(-c-a)]=
当a=-1,b=1,c=-1时-[b-2(-5a)]-(-3b+5c)=
收起
1.(2x立方-xyz)-2(x立方-y立方+xyz)+xyz-2y立方。其中x=1,y=2,z=-3
2.5abc-{2的平方b-[3abc-(4ab平方-a的平方b)]}
3.3ab-4ab+8ab-7ab+ab=______.
4.7x-(5x-5y)-y=______.
5.23a3bc2-15ab2c+8abc-24a3bc2-8abc=______...
全部展开
1.(2x立方-xyz)-2(x立方-y立方+xyz)+xyz-2y立方。其中x=1,y=2,z=-3
2.5abc-{2的平方b-[3abc-(4ab平方-a的平方b)]}
3.3ab-4ab+8ab-7ab+ab=______.
4.7x-(5x-5y)-y=______.
5.23a3bc2-15ab2c+8abc-24a3bc2-8abc=______.
6.-7x2+6x+13x2-4x-5x2=______.
7.2y+(-2y+5)-(3y+2)=______.
11.(2x2-3xy+4y2)+(x2+2xy-3y2)=______.
12.2a-(3a-2b+2)+(3a-4b-1)=______.
13.-6x2-7x2+15x2-2x2=______.
14.2x-(x+3y)-(-x-y)-(x-y)=______.
16.2x+2y-[3x-2(x-y)]=______.
17.5-(1-x)-1-(x-1)=______.
18.( )+(4xy+7x2-y2)=10x2-xy.
19.(4xy2-2x2y)-( )=x3-2x2y+4xy2+y3.
21.已知A=x3-2x2+x-4,B=2x3-5x+3,计算A+B=______.
22.已知A=x3-2x2+x-4,B=2x3-5x+3,计算A-B=______.
23.若a=-0.2,b=0.5,代数式-(|a2b|-|ab2|)的值为______.
25.一个多项式减去3m4-m3-2m+5得-2m4-3m3-2m2-1,那么这个多项式等于______.
26.-(2x2-y2)-[2y2-(x2+2xy)]=______.
27.若-3a3b2与5ax-1by+2是同类项,则x=______,y=______.
28.(-y+6+3y4-y3)-(2y2-3y3+y4-7)=______.
29.化简代数式4x2-[7x2-5x-3(1-2x+x2)]的结果是______.
30.2a-b2+c-d3=2a+( )-d3=2a-d3-( )=c-( ).
31.3a-(2a-3b)+3(a-2b)-b=______.
32.化简代数式x-[y-2x-(x+y)]等于______.
33.[5a2+( )a-7]+[( )a2-4a+( )]=a2+2a+1.
34.3x-[y-(2x+y)]=______.
35.化简|1-x+y|-|x-y|(其中x<0,y>0)等于______.
36.已知x≤y,x+y-|x-y|=______.
37.已知x<0,y<0,化简|x+y|-|5-x-y|=______.
38.4a2n-an-(3an-2a2n)=______.
39.若一个多项式加上-3x2y+2x2-3xy-4得
2x2y+3xy2-x2+2xy,
则这个多项式为______.
40.-5xm-xm-(-7xm)+(-3xm)=______.
41.当a=-1,b=-2时,
[a-(b-c)]-[-b-(-c-a)]=______.
43.当a=-1,b=1,c=-1时,
-[b-2(-5a)]-(-3b+5c)=______.
44.-2(3x+z)-(-6x)+(-5y+3z)=______.
45.-5an-an+1-(-7an+1)+(-3an)=______.
46.3a-(2a-4b-6c)+3(-2c+2b)=______.
48.9a2+[7a2-2a-(-a2+3a)]=______.
50.当2y-x=5时,5(x-2y)2-3(-x+2y)-100=______.
3ab-4ab+8ab-7ab+ab=______.
7x-(5x-5y)-y=______.
23a3bc2-15ab2c+8abc-24a3bc2-8abc=______.
-7x2+6x+13x2-4x-5x2=______.
2y+(-2y+5)-(3y+2)=______.
(2x2-3xy+4y2)+(x2+2xy-3y2)=______.
2a-(3a-2b+2)+(3a-4b-1)=______.
-6x2-7x2+15x2-2x2=_____.
2x-(x+3y)-(-x-y)-(x-y)=______.
2x+2y-[3x-2(x-y)]=______.
5-(1-x)-1-(x-1)=______.
( )+(4xy+7x2-y2)=10x2-xy .
(4xy2-2x2y)-( )=x3-2x2y+4xy2+y3.
(4x2-8x+5)-(x3+3x2-6x+2).
(0.3x3-x2y+xy2-y3)-(-0.5x3-x2y+0.3xy2).
-{2a2b-[3abc-(4ab2-a2b)]}.
(5a2b+3a2b2-ab2)-(-2ab2+3a2b2+a2b).
(x2-2y2-z2)-(-y2+3x2-z2)+(5x2-y2+2z2).
(3a6-a4+2a5-4a3-1)-(2-a+a3-a5-a4).
(4a-2b-c)-5a-[8b-2c-(a+b)].
(2m-3n)-(3m-2n)+(5n+m).
(3a2-4ab-5b2)-(2b2-5a2+2ab)-(-6ab).
xy-(2xy-3z)+(3xy-4z).
(-3x3+2x2-5x+1)-(5-6x-x2+x3).
3x-(2x-4y-6x)+3(-2z+2y).
(-x2+4+3x4-x3)-(x2+2x-x4-5).
若A=5a2-2ab+3b2,B=-2b2+3ab-a2,计算A+B.
已知A=3a2-5a-12,B=2a2+3a-4,求2(A-B).
2m-{-3n+[-4m-(3m-n)]}.
5m2n+(-2m2n)+2mn2-(+m2n).
4(x-y+z)-2(x+y-z)-3(-x-y-z).
2(x2-2xy+y2-3)+(-x2+y2)-(x2+2xy+y2).
2(a2-ab-b2)-3(4a-2b)+2(7a2-4ab+b2).
97.已知a+b=2,a-b=-1,求3(a+b)2(a-b)2-5(a+b)2×(a-b)2的值.
98.已知A=a2+2b2-3c2,B=-b2-2c2+3a2,C=c2+2a2-3b2,求(A-B)+C.
99.求(3x2y-2xy2)-(xy2-2x2y),其中x=-1,y=2.
101.已知|x+1|+(y-2)2=0,求代数式5(2x-y)-3(x-4y)的值
当m=2,n=1时,多项式-m-[-(2m-3n)]+[-(-3m)-4n]等于
当m=-1时,-2m2-[-4m2+(-m2)]等于
若A=3x2-5x+2,B=3x2-5x+6,则A与B的大小
当a=2,b=1时,-a2b+3ba2-(-2a2b)等于
减去-3m等于5m2-3m-5的代数式是
|1-x+y|-|x-y|(其中x<0,y>0)等于
代数式x-[y-2x-(x+y)]等于
已知x≤y,x+y-|x-y|
已知x<0,y<0,化简|x+y|-|5-x-y|
若一个多项式加上-3x2y+2x2-3xy-4得2x2y+3xy2-x2+2xy, 则这个多项式为
已知A=x3-2x2+x-4,B=2x3-5x+3,计算A+B
已知A=x3-2x2+x-4,B=2x3-5x+3,计算A-B
若a=-0.2,b=0.5,代数式-(|a2b|-|ab2|)的值为
一个多项式减去3m4-m3-2m+5得-2m4-3m3-2m2-1,那么这个多项式等于
若-3a3b2与5ax-1by+2是同类项,则x=______,y=______.
当a=-1,b=-2时[a-(b-c)]-[-b-(-c-a)]=
当a=-1,b=1,c=-1时-[b-2(-5a)]-(-3b+5c)=
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