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多项式的化简
1.已知x+y=5,2x-y=1,化简xy x+y的平方-y的平方xy-x+2x x-y的平方,并求它们的值
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-4bT=.
13.-6x2-7x2+15x2-2x2=.
14.2x-x+3y--x-y-x-y=.
16.2x+2y-[3x-2x-y]=.
17.5-l-x T-x-1=.
18.+4xy+7x2-y2二10x2-xy.
19.4xy2-2x2y-=x3-2x2y+4xy2+y
3.
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|-1ab2|的值为.
25.一个多项式减去3n14-m3-2m+5得-2m4-3m3-2m2-1,那么这个多项式等于.
26.-2x2-y2-[2y2-x2+2xy]二.
27.若-3a3b2与5ax-lby+2是同类项,贝U x二,y二
28.-y+6+3y4-y3-2y2-3y3+y4-7=.
29.化简代数式4x2-[7x2-5x-3l-2x+x2]的结果是.
30.2a-b2+c-d3=2a+-d3=2a-d3-=c-.
31.3a-2a-3b+3a-2b-b=.
32.化简代数式x-y-2x-x+y]等于.
33.[5a2+a-7]+[a2-4a+]=a2+2a+L
34.3x-[y-2x+y]=.
35.化简11-x+y|-|x-y|其中x0,y0等于.
36.已知xWy,x+y-1x-y|=.
37.已知x0,y0,化简|x+y|-15-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=-l,b=-2时,_a-b-c]-[-b--c-a]=.
43.当a=T,b=l,c=-l时,
44.-25a]--3b+5c=.
45.~23x+z--6x+-5y+3z=.
46.-5an-an+l--7an+l+-3an=.
47.3a-2a-4b-6c+3-2c+2b=.
48.9a2+[7a2_2a__a2+3a]=.
50.当2y-x=5时,5x-2y2-3-x+2y-100=二选择
52.下列各式中计算结果为-7x-5x2+6x3的是口A.3x-5x2+6x3-10x;B.3x-5x2+6x3+10x;C.3x-5x2-6x3+10x;D.3x-5x2-6x3-lOx.
53.把-x-y+3x+y-5x+y合并同类项得口A.x-y-2x+y;B.-3x+y;C.-x-y-2x+y;D.3x+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的代数式是口A.5m2-l;B.5m2-6m-5;C.5m2+l;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,正确的选择是口A.没有同类项;B.2与⑷是同类项;C.2与⑸是同类项;D.2与⑷不是同类项.
59.若A和B均为五次多项式,则A-B一定是口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.AB;B.A二B;C.AB;D.无法确定.
62.当m=-l时,-2m2-[-4m2+-m2]等于[]A.-7;B.3;C.1;D.
2.
63.当m=2,n=l时,多项式-3n]+3m-4n]等于口A.1;B.9;C.3;D.
5.口。