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1、 整式的加减专项练习100题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)-2x26、 (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)+313, -2(ab-3a2)-2b2
2、-(5ab+a2)+2ab14, (x2-xy+y)-3(x2+xy-2y)15, 3x2-7x-(4x-3)-2x216、 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)-3a23, 3a2-9a+5-(-7a2+10a-5);24, -3a2b-(2ab2-a2b)-(2a2b+
3、4ab2)25、 (5a-3a2+1)-(4a3-3a2);26, -2(ab-3a2)-2b2-(5ab+a2)+2ab 27, (8xyx2y2)(y2x28xy); 28, (2x23x)4(xx2); 29, 3x27x(4x3)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)-2x2-(2x2-xy+y2)35、 aba2bab(a2b)1 36, (8xy
4、x2y2)(y2x28xy); 37, 2x(3x2y3)(5y2); 38, (3a2b)(4a3b1)(2ab3)39, 4x3(6x3)(9x3)40, 32xy2yx26xy4x2y 41, 13(2aba)十12(2a3ab)42, 3x5x(3x2); 43, (3a2bab2)(ab23a2b)44, 45, (x254x3)(x35x4) 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, xy+(-xy)-2xy2-(-3y2x) 50
5、, 5a2-a2-(5a2-2a)-2(a2-3a) 51, 5m-7n-8p+5n-9m+8p 52, (5x2y-7xy2)-(xy2-3x2y) 53, 3x2y-2x2y-3(2xy-x2y)-xy54, 3x2-5x-4( x2-1)+5x255, 2a3b- a3b-a2b+ a2b-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
6、+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-ab265, 5m2-m2+(5m2-2m)-2(m2-3m)66、 -2m-3(m-n+1)-2-167, a-( a-4b-6c)+3(-2c+2b)68、 -5an-an-(-7an)+(-3an)69, x2y-3xy2+2yx2-y2x70、 a2b-0.4ab2- a2b+ ab2;71, 3a-2c
7、-6a-(c-b)+c+(a+8b-6)72, -3(xy-2x2)-y2-(5xy-4x2)+2xy;73, 化简, 求值x2(x2y2),其中x2, y74, 化简, 求值x2(xy2)(xy2),其中x2,y75, 其中x1;76、 化简,求值(4m+n)-1-(m-4n),m= n=-177, 化简, 求值2(a2b2b3ab3)3a3(2ba23ab23a3)4b3,其中a3,b278, 化简,求值:(2x3-xyz)-2(x3-y3+xyz)+(xyz-2y3),其中x=1,y=2,z=-79, 化简,求值:5x2-3x-2(2x-3)+7x2,其中x=-2 80、 若两个多项式的
8、与是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5x2y2x2y与2xy24x2y的与83, 求3x2x5与4x7x2的差84, 计算 5y+3x+5z与12y+7x-3z的与85, 计算8xy+3xy-2与-2xy+5xy-3的差86, 多项式-x+3xy-y与多项式M的差是-x2-xy+y,求多项式M87、 当x=- ,y=-3时,求代数式3(x2-2xy)-3x2-2y+2(xy+y)的值88、 化简再求值5abc-2ab-3abc-(4ab-ab)-2ab,其中a=-2,b=3
9、,c=-89, 已知A=a-2ab+b,B=a+2ab+b(1)求A+B;(2)求(B-A);90, 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,你能否扶植小明同学求得正确答案?91, 已知:M=3x2+2x-1,N=-x2-2+3x,求M-2N92, 已知,求3AB93、 已知Ax2xyy2,B3xyx2,求2A3B94, 已知(b1)20,求5ab22a2b(4ab22a2b)的值95, 化简求值:5abc-2a2b+3abc-2(4ab2-a2b),其中a, b, c满意|a-1|+|b-2|+c2=096、 已
10、知a,b,z满意:(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)-4x2y97, 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)=0,且B-2A=a,求a的值100, 有两个多项式:A2a24a1,B2(a22a)3,当a取随意有理数时,请比较A与B的大小答案:1, 3(a+5b)
11、-2(b-a)=5a+13b2, 3a-(2b-a)+b=4a-b3, 2(2a2+9b)+3(-5a2-4b)=11a+6b4, (x3-2y3-3x2y)-(3x3-3y3-7x2y)= -2x3+y3+4x2y5, 3x2-7x-(4x-3)-2x2 = 5x2 -3x-36, (2xy-y)-(-y+yx)= xy7, 5(a2b-3ab)-2(ab-7ab) = -ab+11ab8, (-2ab+3a)-2(2a-b)+2ab= -2a+b9, (7mn-5mn)-(4mn-5mn)= 3mn 10, (5a2+2a-1)-4(3-8a+2a2)= -3a2+34a-13 11, -
12、3xy+3xy+2xy-2xy= -xy+xy 12, 2(a-1)-(2a-3)+3=413, -2(ab-3a)-2b-(5ab+a)+2ab= 7a+ab-2b14, (x-xy+y)-3(x+xy-2y)= -2x-4xy+7y15, 3x-7x-(4x-3)-2x=5x-3x-316, 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)=-2a-4a20, 5m-7n
13、-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=7a+ab-2b 27, (8xyx2y2)(y2x28xy)=0 28, (2x23x)4(xx2
14、) = 6x-x-29, 3x27x(4x3)2x2= 5x23x3 30, 5a+(4b-3a)-(-3a+b)= 5a+3b 31, (3a-3ab+2b)+(a+2ab-2b)= 4a-ab 32, 2ab+2ab-2(ab-1)+2ab+2= -1 33, (2a2-1+2a)-3(a-1+a2)= -a2-a+2 34, 2(x2-xy)-3(2x2-3xy)-2x2-(2x2-xy+y2)=-2x2+5xy-2y235, aba2bab(a2b)1 = ab-1 36, (8xyx2y2)(y2x28xy)=0 37, 2x(3x2y3)(5y2)=-x-3y-1 38, (3a2
15、b)(4a3b1)(2ab3)= -a-4b+439, 4x3(6x3)(9x3) x340, 32xy2yx26xy4x2y = -2 x2y+4 41, 13(2aba)十12(2a3ab)=2-7a42, 3x5x(3x2)=-5x+2 43, (3a2bab2)(ab23a2b)= -2ab2 44, = 5x+y 45, (x254x3)(x35x4)= 3xx25x+146, (5a2-2a+3)-(1-2a+a2)+3(-1+3a-a2)=a2+9a-147, 5(3a2b-ab2)-4(-ab2+3a2b)=3a2b-ab2 48, 4a2+2(3ab-2a2)-(7ab-1)
16、=1-ab 49, xy+(-xy)-2xy2-(-3y2x)=xy+xy 50, 5a2-a2-(5a2-2a)-2(a2-3a)=11a2-8a 51, 5m-7n-8p+5n-9m+8p=-4m-2n 52, (5x2y-7xy2)-(xy2-3x2y)=8x2y-6xy2 53, 3x2y-2x2y-3(2xy-x2y)-xy=-2x2y+7xy54, 3x2-5x-4( x2-1)+5x2 = 10x-5x-455, 2a3b- a3b-a2b+ a2b-ab2 = a3b- a2b-ab2 56, (a2+4ab-4b2)-3(a2+b2)-7(b2-ab)=-2a2+11ab-1
17、4b257, a2+2a3+(-2a3)+(-3a3)+3a2 = -3a3+4a2 58, 5ab+(-4a2b2)+8ab2-(-3ab)+(-a2b)+4a2b2=8ab+8ab2-a2b 59, (7y-3z)-(8y-5z)=-y+2z 60, -3(2x2-xy)+4(x2+xy-6)=-2x2+7xy-2461, (x3+3x2y-5xy2+9y3)+(-2y3+2xy2+x2y-2x3)-(4x2y-x3-3xy2+7y3)=0 62, -3x2y+2x2y+3xy2-2xy2 = -x2y+xy263, 3(a2-2ab)-2(-3ab+b2)=3a-2b64, 5abc-2
18、a2b-3abc-(4a2b-ab2=8abc-6a2b+ab265, 5m2-m2+(5m2-2m)-2(m2-3m)=m2-4m66, -2m-3(m-n+1)-2-1=m-3n+467, a-( a-4b-6c)+3(-2c+2b)= -a+10b68, -5an-an-(-7an)+(-3an)= -2an69, x2y-3xy2+2yx2-y2x=3x2y-4xy271、 a2b-0.4ab2- a2b+ ab2 = -a2b71, 3a-2c-6a-(c-b)+c+(a+8b-6)= 10a+9b-2c-672, -3(xy-2x2)-y2-(5xy-4x2)+2xy= 2x-y7
19、3, 化简, 求值x2(x2y2),其中x2, y 原式=2x2y22 =6 74, 化简, 求值x2(xy2)(xy2),其中x2,y 原式=-3x+y=675, 其中x1; 原式=x+x-x+6=676, 化简,求值(4m+n)-1-(m-4n),m= n=-1 原式=5m-3n-1=577, 化简, 求值2(a2b2b3ab3)3a3(2ba23ab23a3)4b3,其中a3,b2 原式=-2ab3+3ab21278, 化简,求值:(2x3-xyz)-2(x3-y3+xyz)+(xyz-2y3),其中x=1,y=2,z=-3 原式=-2xyz=679, 化简,求值:5x2-3x-2(2x
20、-3)+7x2,其中x=-2 原式=-2x+x-6=-1680, 若两个多项式的与是2x2+xy+3y2,一个加式是x2-xy,求另一个加式 (2x2+xy+3y2 ) ( x2-xy)= x2+2xy+3y281, 若2a2-4ab+b2与一个多项式的差是-3a2+2ab-5b2,试求这个多项式( 2a2-4ab+b2 )(-3a2+2ab-5b2)=5a2 6ab+6b282, 求5x2y2x2y与2xy24x2y的与 (5x2y2x2y)+(2xy24x2y)=3xy22x2y83, 求3x2x5与4x7x2的差 (3x2x5)(4x7x2)=4x22x9 84, 计算 5y+3x+5z
21、与12y+7x-3z的与 (5y+3x+5z)+(12y+7x-3z)=17y+10x+2z 85, 计算8xy+3xy-2与-2xy+5xy-3的差 (8xy+3xy-2)(-2xy+5xy-3)=5xy+3xy+186, 多项式-x+3xy-y与多项式M的差是-x2-xy+y,求多项式M M=-x2+4xyy87, 当x=- ,y=-3时,求代数式3(x2-2xy)-3x2-2y+2(xy+y)的值 原式=-8xy+y= 1588, 化简再求值5abc-2ab-3abc-(4ab-ab)-2ab,其中a=-2,b=3,c=- 原式=83abc-ab-2ab=3689, 已知A=a-2ab+
22、b,B=a+2ab+b(1)求A+B;(2)求(B-A); A+B=2a+2b (B-A)=ab90、 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,你能否扶植小明同学求得正确答案? A=10x2+x+5 A+B=11x2+4x+391, 已知:M=3x2+2x-1,N=-x2-2+3x,求M-2N M-2N=5x24x+392、 已知,求3AB 3AB=11x-13xy+8y93, 已知Ax2xyy2,B3xyx2,求2A3B 2A3B= 5x211xy2y294, 已知(b1)20,求5ab22a2b(4ab22a
23、2b)的值 原式=9ab24a2b=3495, 化简求值:5abc-2a2b+3abc-2(4ab2-a2b),其中a, b, c满意|a-1|+|b-2|+c2=0 原式=8abc-8a2b=-3296, 已知a,b,z满意:(1)已知|x-2|+(y+3)=0,(2)z是最大的负整数,化简求值: 2(x2y+xyz)-3(x2y-xyz)-4x2y 原式=-5x2y+5xyz=9097, 已知a+b=7,ab=10,求代数式(5ab+4a+7b)+(6a-3ab)-(4ab-3b)的值 原式=10a+10b-2ab=5098, 已知m2+3mn=5,求5m2-+5m2-(2m2-mn)-7mn-5的值 原式=2m2+6mn+5=1599、 设A=2x2-3xy+y2+2x+2y,B=4x2-6xy+2y2-3x-y,若|x-2a|+(y-3)=0,且B-2A=a,求a 的值 B-2A=-7x-5y=-14a-15=a a=-1100, 有两个多项式:A2a24a1,B2(a22a)3,当a取随意有理数时,请比较A与B的大小 A=2a24a1 B2a24a3 所以AB第 8 页
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