-3(x2-xy)-x(-2y+2x)⑵(-x5)•x3n-1+x3n•(-x)4
2.(x+2)(y+3)-(x+1)(y-2)⑷(-2m2n)3•mn+(-7m7n12)0-2(mn)-4•m11•n8
3.(5x2y3-4x3y2+6x)÷6x,其中x=-2,y=2⑹(3mn+1)(3mn-1)-(3mn-2)2
4.9992-1⑻20032
5.-2.5×(-4.8)×(0.09)÷(-0.27)
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)=______.
8.(2x2-3xy+4y2)+(x2+2xy-3y2)=______.
9.2a-(3a-2b+2)+(3a-4b-1)=______.
10.-6x2-7x2+15x2-2x2=______.
11.2x-(x+3y)-(-x-y)-(x-y)=______.
12.2x+2y-[3x-2(x-y)]=______.
13.5-(1-x)-1-(x-1)=______.
14.()+(4xy+7x2-y2)=10x2-xy.
15.(4xy2-2x2y)-()=x3-2x2y+4xy2+y3.
16.已知A=x3-2x2+x-4,B=2x3-5x+3,计算A+B=______.
17.已知A=x3-2x2+x-4,B=2x3-5x+3,计算A-B=______.
18.若a=-0.2,b=0.5,代数式-(|a2b|-|ab2|)的值为______.
19.一个多项式减去3m4-m3-2m+5得-2m4-3m3-2m2-1,那么这个多项式等于______.
20.-(2x2-y2)-[2y2-(x2+2xy)]=______.
21.若-3a3b2与5ax-1by+2是同类项,则x=______,y=______.
22.(-y+6+3y4-y3)-(2y2-3y3+y4-7)=______.
23.化简代数式4x2-[7x2-5x-3(1-2x+x2)]的结果是______.
24.2a-b2+c-d3=2a+()-d3=2a-d3-()=c-().
25.3a-(2a-3b)+3(a-2b)-b=______.
26.化简代数式x-[y-2x-(x+y)]等于______.
27.[5a2+()a-7]+[()a2-4a+()]=a2+2a+1.
28.3x-[y-(2x+y)]=______.
29.化简|1-x+y|-|x-y|(其中x<0,y>0)等于______.
30.已知x≤y,x+y-|x-y|=______.
31.已知x<0,y<0,化简|x+y|-|5-x-y|=______.
32.4a2n-an-(3an-2a2n)=______.
33.若一个多项式加上-3x2y+2x2-3xy-4得2x2y+3xy2-x2+2xy,则这个多项式为______.
34.-5xm-xm-(-7xm)+(-3xm)=______.
35.当a=-1,b=-2时,[a-(b-c)]-[-b-(-c-a)]=______.
36.当a=-1,b=1,c=-1时,-[b-2(-5a)]-(-3b+5c)=______.
37.-2(3x+z)-(-6x)+(-5y+3z)=______.
38.-5an-an+1-(-7an+1)+(-3an)=______.
39.3a-(2a-4b-6c)+3(-2c+2b)=______.
40.9a2+[7a2-2a-(-a2+3a)]=______.
41.当2y-x=5时,5(x-2y)2-3(-x+2y)-100=______.
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.
106.当P=a2+2ab+b2,Q=a2-2ab-b2时,求P-[Q-2P-(P-Q)].
107.求2x2-{-3x+5+[4x2-(3x2-x-1)]}的值,其中x=-3.
110.当x=-2,y=-1,z=3时,求5xyz-{2x2y-[3xyz-(4xy2-x2y)]}的值.
113.已知A=x3-5x2,B=x2-6x+3,求A-3(-2B).
115.去括号:{-[-(a+b)]}-{-[-(a-b)]}.
116.去括号:-[-(-x)-y]-[+(-y)-(+x)].
117.已知A=x3+6x-9,B=-x3-2x2+4x-6,计算2A-3B,并把结果放在前面带“-”号的括号内.
118.计算下式,并把结果放在前面带“-”号的括号内:
(-7y2)+(-4y)-(-y2)-(+5y)+(-8y2)+(+3y).
119.去括号、合并同类项,将结果按x的升幂排列,并把后三项放在带有“-”号的括号内:
120.不改变下式的值,将其中各括号前的符号都变成相反的符号:(x3+3x2)-(3x2y-7xy)+(2y3-3y2).
121.把多项式4x2y-2xy2+4xy+6-x2y2+x3-y2的三次项放在前面带有“-”号的括号内,二次项放在前面带有“+”号的括号内,四次项和常数项放在前面带有“-”号的括号内.
122.把下列多项式的括号去掉,合并同类项,并将其各项放在前面带有“-”号的括号内,
黄元元
2019-06-14 08:33:44
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