初一上册整式计算题

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初一上册整式计算题(一)填空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.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).(五)综合练习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,再求2x-2[3x-(5x2-2x+1)]-4x2的值,其中x=-1.123.合并同类项:7x-1.3z-4.7-3.2x-y+2.1z+5-0.1y.124.合并同类项:5m2n+5mn2-mn+3m2n-6mn2-8mn.126.去括号,合并同类项:(1)(m+1)-(-n+m);(2)4m-[5m-(2m-1)].127.化简:2x2-{-3x-[4x2-(3x2-x)+(x-x2)]}.128.化简:-(7x-y-2z)-{[4x-(x-y-z)-3x+z]-x}.129.计算:(+3a)+(-5a)+(-7a)+(-31a)-(+4a)-(-8a).130.化简:a3-(a2-a)+(a2-a+1)-(1-a4+a3).131.将x2-8x+2x3-13x2-2x-2x3+3先合并同类项,再求值,其中x=-4.132.在括号内填上适当的项:[()-9y+()]+2y2+3y-4=11y2-()+13.133.在括号内填上适当的项:(-x+y+z)(x+y-z)=[y-()][y+()].134.在括号内填上适当的项:(3x2+xy-7y2)-()=y2-2xy-x2.135.在括号内填上适当的项:(1)x2-xy+y-1=x2-();(2)[()+6x-7]-[4x2+()-()]=x2-2x+1.136.计算4x2-3[x+4(1-x)-x2]-2(4x2-1)的值.137.化简:138.用竖式计算(-x+5+2x4-6x3)-(3x4+2x2-3x3-7).139.已知A=11x3+8x2-6x+2,B=7x3-x2+x+3,求2(3A-2B).140.已知A=x3-5x2,B=x3-11x+6,C=4x-3,求(1)A-B-C;(2)(A-B-C)-(A-B+C).141.已知A=3x2-4x3,B=x3-5x2+2,计算(1)A+B;(2)B-A.142.已知x<-4,化简|-x|+|x+4|-|x-4|.146.求两代数式-1.56a+3.2a3-0.47,2.27a3-0.02a2+4.03a+0.53的差与6-0.15a+3.24a2+5.07a3的和.-0.3,y=-0.2.150.已知(x-3)2+|y+1|+z2=0,求x2-2xy-5x2+12xz+3xy-z2-8xz-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