①化简：[x(x^3y^2)^2-2(x^2y)^3]×(-xy^2)^3②先化简再求值：[x^2y^2(x+y)^2-xy^2(x^3+xy^2)]/(1/2x^2y),其中x=1/2,y=1③先化简再求值：[(a+2b)(a-2b)-(2a-b)^2+(3a-b)(3a-5b)]/2a,其中a=-1,b=2④先化简再求值：(a+b)(a-b)+2a^2,其

来源：学生作业帮助网 编辑：作业帮 时间：2024/04/30 07:28:47
①化简：[x(x^3y^2)^2-2(x^2y)^3]×(-xy^2)^3②先化简再求值：[x^2y^2(x+y)^2-xy^2(x^3+xy^2)]/(1/2x^2y),其中x=1/2,y=1③先化简再求值：[(a+2b)(a-2b)-(2a-b)^2+(3a-b)(3a-5b)]/2a,其中a=-1,b=2④先化简再求值：(a+b)(a-b)+2a^2,其

①化简：[x(x^3y^2)^2-2(x^2y)^3]×(-xy^2)^3②先化简再求值：[x^2y^2(x+y)^2-xy^2(x^3+xy^2)]/(1/2x^2y),其中x=1/2,y=1③先化简再求值：[(a+2b)(a-2b)-(2a-b)^2+(3a-b)(3a-5b)]/2a,其中a=-1,b=2④先化简再求值：(a+b)(a-b)+2a^2,其
①化简：[x(x^3y^2)^2-2(x^2y)^3]×(-xy^2)^3
②先化简再求值：[x^2y^2(x+y)^2-xy^2(x^3+xy^2)]/(1/2x^2y),其中x=1/2,y=1
③先化简再求值：[(a+2b)(a-2b)-(2a-b)^2+(3a-b)(3a-5b)]/2a,其中a=-1,b=2
④先化简再求值：(a+b)(a-b)+2a^2,其中a=1,b=根号2

①化简：[x(x^3y^2)^2-2(x^2y)^3]×(-xy^2)^3②先化简再求值：[x^2y^2(x+y)^2-xy^2(x^3+xy^2)]/(1/2x^2y),其中x=1/2,y=1③先化简再求值：[(a+2b)(a-2b)-(2a-b)^2+(3a-b)(3a-5b)]/2a,其中a=-1,b=2④先化简再求值：(a+b)(a-b)+2a^2,其
1. [x(x3y2)2-2(x2y)3]×(-xy2)3
=[x(x6y4)-2(x6y3)]×(-x3y6)
=(x7y4-2x6y3)×(-x3y6)
=-x10y10+2x9y9
= x9y9(2-xy)
2.        [x2y2(x+y)2-xy2(x3+xy2)]/(1/2x2y)
                =[x2y2(x2+2xy+y2)-x4y2- x2y4] /(1/2x2y)
        =( x4y2+2 x3y3+ x2y4- x4y2- x2y4) /(1/2x2y)
        =2 x3y3/(1/2x2y)
        =4xy2
∵x=1/2,y=1;∴4xy2=4×1/2×12=2
3.        [(a+2b)(a-2b)-(2a-b)2+(3a-b)(3a-5b)]/2a
              =[a2-2ab+2ab-4b2-(4a2-4ab+b2)+(9a2-15ab-3ab+5b2)]/2a
       =( a2-4b2-4a2+4ab-b2+9a2-18ab+5b2)/2a
       =(6a2-14ab)/2a
              =3a-7b
     ∵a=-1,b=2;∴3a-7b=3×(-1)-7×2=-17
4.        (a+b)(a-b)+2a2
               =a2-b2+2a2
               =3a2-b2
     ∵a=1,b=√2;∴3a2-b2=3-2=1

化简：{2/3x-2/(x+y)[(x+y)/3x-x-y]}/(x+y)/x 化简3x-2/(x+y)[(x+y)/3x-x-y]÷(x-y)/x 化简 3x(x^2-x-1)-(x+1)(3x^-x) X^3(x-y)+x(y-x) 化简:(x-3y)(x+y)-(x-2y)(x+2y)-(x-y)平方 化简y(x+y)+(x+y)(x-y)-x^2 化简:5(x-y)+2(x+y)-3(x-y) 化简3(x-y)-7(x--y)+2(y-x) x(x-y)2-(y-x)3 [2/3x-2/x+y(x+y/3x-x-y)]/x-y/x 计算2/3x-2/x+y(x+y/3x-x-y)/x-y/x 化简：{2/3x-2/(x+y)[(x+y)/3x-x-y]}/【(x-y)/x】的负二次方 化简(X-2Y)-(Y-3X) 化简：3x（2x+y)-2x(x-y) x是字母x不是乘号 (x+y)-(x-y)^3÷(x-y)(x+y)×2y化简e , 化简：2x-{-3y+[4x-(3x-y]} 3x^2(x-y)+12(y-x)化简 1/(x-y)+1/(x+y)+2x/(x^2+y^2)+4x^3/(x^4+y^4)化简 化简 [(x-y)^2(x+y)^-2/2(x+y)^2(x-y)^-2]^-3