1整式的加减专项练习100题(有答案)1、3(a+5b)-2(b-a)2、3a-(2b-a)+b3、2(2a2+9b)+3(-5a2-4b)4、(x3-2y3-3x2y)-(3x3-3y3-7x2y)5、3x2-[7x-(4x-3)-2x2]6、(2xy-y)-(-y+yx)7、5(a2b-3ab2)-2(a2b-7ab)8、(-2ab+3a)-2(2a-b)+2ab9、(7m2n-5mn)-(4m2n-5mn)10、(5a2+2a-1)-4(3-8a+2a2).11、-3x2y+3xy2+2x2y-2xy2;12、2(a-1)-(2a-3)+3.13、-2(ab-3a2)-[2b2-(5ab+a2)+2ab]14、(x2-xy+y)-3(x2+xy-2y)15、3x2-[7x-(4x-3)-2x2]16、a2b-[2(a2b-2a2c)-(2bc+a2c)];17、-2y3+(3xy2-x2y)-2(xy2-y3).18、2(2x-3y)-(3x+2y+1)19、-(3a2-4ab)+[a2-2(2a+2ab)].20、5m-7n-8p+5n-9m-p;21、(5x2y-7xy2)-(xy2-3x2y);22、3(-3a2-2a)-[a2-2(5a-4a2+1)-3a].23、3a2-9a+5-(-7a2+10a-5);224、-3a2b-(2ab2-a2b)-(2a2b+4ab2).25、(5a-3a2+1)-(4a3-3a2);26、-2(ab-3a2)-[2b2-(5ab+a2)+2ab]27、(8xy-x2+y2)+(-y2+x2-8xy);28、(2x2-21+3x)-4(x-x2+21);29、3x2-[7x-(4x-3)-2x2].30、5a+(4b-3a)-(-3a+b);31、(3a2-3ab+2b2)+(a2+2ab-2b2);32、2a2b+2ab2-[2(a2b-1)+2ab2+2].33、(2a2-1+2a)-3(a-1+a2);34、2(x2-xy)-3(2x2-3xy)-2[x2-(2x2-xy+y2)].35、-32ab+43a2b+ab+(-43a2b)-136、(8xy-x2+y2)+(-y2+x2-8xy);37、2x-(3x-2y+3)-(5y-2);38、-(3a+2b)+(4a-3b+1)-(2a-b-3)39、4x3-(-6x3)+(-9x3)40、3-2xy+2yx2+6xy-4x2y41、1-3(2ab+a)十[1-2(2a-3ab)].42、3x-[5x+(3x-2)];43、(3a2b-ab2)-(ab2+3a2b)344、yxxyx3233245、(-x2+5+4x3)+(-x3+5x-4)46、(5a2-2a+3)-(1-2a+a2)+3(-1+3a-a2).47、5(3a2b-ab2)-4(-ab2+3a2b).48、4a2+2(3ab-2a2)-(7ab-1).49、21xy+(-41xy)-2xy2-(-3y2x)50、5a2-[a2-(5a2-2a)-2(a2-3a)]51、5m-7n-8p+5n-9m+8p52、(5x2y-7xy2)-(xy2-3x2y)53、3x2y-[2x2y-3(2xy-x2y)-xy]54、3x2-[5x-4(21x2-1)]+5x255、2a3b-21a3b-a2b+21a2b-ab2;56、(a2+4ab-4b2)-3(a2+b2)-7(b2-ab).57、a2+2a3+(-2a3)+(-3a3)+3a2;58、5ab+(-4a2b2)+8ab2-(-3ab)+(-a2b)+4a2b2;59、(7y-3z)-(8y-5z);60、-3(2x2-xy)+4(x2+xy-6).61、(x3+3x2y-5xy2+9y3)+(-2y3+2xy2+x2y-2x3)-(4x2y-x3-3xy2+7y3)62、-3x2y+2x2y+3xy2-2xy2;63、3(a2-2ab)-2(-3ab+b2);64、5abc-{2a2b-[3abc-(4a2b-ab2]}.65、5m2-[m2+(5m2-2m)-2(m2-3m)].66、-[2m-3(m-n+1)-2]-1.467、31a-(21a-4b-6c)+3(-2c+2b)68,-5an-an-(-7an)+(-3an)69、x2y-3xy2+2yx2-y2x70,41a2b-0.4ab2-21a2b+52ab2;71、3a-{2c-[6a-(c-b)+c+(a+8b-6)]}72、-3(xy-2x2)-[y2-(5xy-4x2)+2xy];73、化简、求值21x2-2212-(x+y)2-23(-32x2+31y2),其中x=-2,y=-3474、化简、求值21x-2(x-31y2)+(-23x+31y2),其中x=-2,y=-32.75、xxxxxx5)64(213223312323其中x=-121;76、化简,求值(4m+n)-[1-(m-4n)],m=52n=-13177、化简、求值2(a2b+2b3-ab3)+3a3-(2ba2-3ab2+3a3)-4b3,其中a=-3,b=78、化简,求值:(2x3-xyz)-2(x3-y3+xyz)+(xyz-2y3),其中x=1,y=2,z=-3.79、化简,求值:5x2-[3x-2(2x-3)+7x2],其中x=-2.80、若两个多项式的和是2x2+xy+3y2,一个加式是x2-xy,求另一个加式.81、若2a2-4ab+b2与一个多项式的差是-3a2+2ab-5b2,试求这个多项式.82、求5x2y-2x2y与-2xy2+4x2y的和.83、求3x2+x-5与4-x+7x2的差.84、计算5y+3x+5z2与12y+7x-3z2的和85、计算8xy2+3x2y-2与-2x2y+5xy2-3的差86、多项式-x2+3xy-21y与多项式M的差是-21x2-xy+y,求多项式M87、当x=-21,y=-3时,求代数式3(x2-2xy)-[3x2-2y+2(xy+y)]的值.88,化简再求值5abc-{2a2b-[3abc-(4ab2-a2b)]-2ab2},其中a=-2,b=3,c=-4189、已知A=a2-2ab+b2,B=a2+2ab+b2(1)求A+B;(2)求41(B-A);590、小明同学做一道题,已知两个多项式A,B,计算A+B,他误将A+B看作A-B,求得9x2-2x+7,若B=x2+3x-2,你能否帮助小明同学求得正确答案?91、已知:M=3x2+2x-1,N=-x2-2+3x,求M-2N.92、已知222244,5AxxyyBxxyy,求3A-B93、已知A=x2+xy+y2,B=-3xy-x2,求2A-3B.94、已知2a+(b+1)2=0,求5ab2-[2a2b-(4ab2-2a2b)]的值.95、化简求值:5abc-2a2b+[3abc-2(4ab2-a2b)],其中a、b、c满足|a-1|+|b-2|+c2=0.96、已知a,b,z满足:(1)已知|x-2|+(y+3)2=0,(2)z是最大的负整数,化简求值:2(x2y+xyz)-3(x2y-xyz)-4x2y.97、已知a+b=7,ab=10,求代数式(5ab+4a+7b)+(6a-3ab)-(4ab-3b)的值.98、已知m2+3mn=5,求5m2-[+5m2-(2m2-mn)-7mn-5]的值99、设A=2x2-3xy+y2+2x+2y,B=4x2-6xy+2y2-3x-y,若|x-2a|+(y-3)2=0,且B-2A=a,求a的值.100、有两个多项式:A=2a2-4a+1,B=2(a2-2a)+3,当a取任意有理数时,请比较A与B的大小.答案:1、3(a+5b)-2(b-a)=5a+13b2、3a-(2b-a)+b=4a-b.3、2(2a2+9b)+3(-5a2-4b)=—11a2+6b24、(x3-2y3-3x2y)-(3x3-3y3-7x2y)=-2x3+y3+4x2y5、3x2-[7x-(4x-3)-2x2]=5x2-3x-36、(2xy-y)-(-y+yx)=xy7、5(a22b-3ab2)-2(a2b-7ab)=-a2b+11ab8、(-2ab+3a)-2(2a-b)+2ab=-2a+b9、(7m2n-5mn)-(4m2n-5mn)=3m2n10、(5a2+2a-1)-4(3-8a+2a2)=-3a2+34a-1311、-3x2y+3xy2+2x2y-2xy2=-x2y+xy212、2(a-1)-(2a-3)+3.=413、-2(ab-3a2)-[2b2-(5ab+a2)+2ab]=7a2+ab-2b214、(x2-xy+y)-3(x2+xy-2y)=-2x2-4xy+7y15、3x2-[7x-(4x-3)-2x2]=5x2-3x-3616、a2b-[2(a2b-2a2c)-(2bc+a2c)]=-a2b+2bc+6a2c17、-2y3+(3xy2-x2y)-2(xy2-y3)=xy2-x2y18、2(2x-3y)-(3x+2y+1)=2x-8y-119、-(3a2-4ab)+[a2-2(2a+2ab)]=-2a2-4a20、5m-7n-8p+5n-9m-p=-4m-2n-9p21、(5x2y-7xy2)-(xy2-3x2y)=4xy2-4x2y22、3(-3a2-2a)-[a2-2(5a-4a2+1)-3a]=-18a2+7a+223、3a2-9a+5-(-7a2+10a-5)=10a2-19a+1024、-3a2b-(2ab2-a2b)-(2a2b+4ab2)=-4a2b-64ab225、(5a-3a2+1)-(4a3-3a2)=5a-4a2+126、-2(ab-3a2)-[2b2-(5ab+a2)+2ab]=7a2+ab-2b227、(8xy-x2+y2)+(-y2+x2-8xy)=028、(2x2-21+3x)-4(x-x2+21)=6x2-x-2529、3x2-[7x-(4x-3)-2x2]=5x2-3x-330、5a+(4b-3a)-(-3a+b)=5a+3b31、(3a2-3ab+2b2)+(a2+2ab-2b2)=4a2-ab32、2a2b+2ab2-[2(a2b-1)+2ab2+2].=-133、(2a2-1+2a)-3(a-1+a2)=-a2-a+234、2(x2-xy)-3(2x2-3xy)-2[x2-(2x2-xy+y2)]=-2x2+5xy-2y235、-32ab+43a2b+ab+(-43a2b)-1=31ab-136、(8xy-x2+y2)+(-y2+x2-8xy)=037、2x-(3x-2y+3)-(5y-2)=-x-3y-138、-(3a+2b)+(4a-3b+1)-(2a-b-3)=-a-4b+439、4x3-(-6x3)+(-9x3)=x340、3-2xy+2yx2+6xy-4x2y=-2x2y+441、1-3(2ab+a)十[1-2(2a-3ab)]=2-7a42、3x-[5x+(3x-2)]=-5x+243、(3a2b-ab2)-(ab2+3a2b)=-2ab244、yxxyx32332=5x+y45、(-x2+5+4x3)+(-x3+5x-4)=3x3-x2+5x+146、(5a2-2a+3)-(1-2a+a2)+3(-1+3a-a2)=a2+9a-147、5(3a2b-ab2)-4(-ab2+3a2b).=3a2b-ab248、4a2+2(3ab-2a2)-(7ab-1)=1-ab49、21xy+(-41xy)-2xy2-(-3y2x)=41xy+xy250、5a2-[a2-(5a2-2a)-2(a2-3a)]=11a2-8a51、5m-7n-8p+5n-9m+8p=-4m-2n52、(5x2y-7xy2)-(xy2-3x2y)=8x2y-6xy253、3x2y-[2x2y-3(2xy-x2y