(2x-y)^7(y-2x)^5(y-2x)^4
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(2x-y)^7(y-2x)^5(y-2x)^4(2x-y)^7(y-2x)^5(y-2x)^4(2x-y)^7(y-2x)^5(y-2x)^4(2x-y)^7(y-2x)^5(y-2x)^4=(2x
(2x-y)^7(y-2x)^5(y-2x)^4
(2x-y)^7(y-2x)^5(y-2x)^4
(2x-y)^7(y-2x)^5(y-2x)^4
(2x-y)^7(y-2x)^5(y-2x)^4
=(2x-y)^7[-(2x-y)^5](2x-y)^4
=-(2x-y)^(7+5+4)
=-(2x-y)^16
x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2
解方程组(x+y)(x-2y)=-5 (x-y)(x+2y)=7
{6(x-y)-7(x+y)=21 {2(x-y)-5(x+y)=-1
化简:3(x-y)²-7(x-y)+ 2(x-y)²+5(x-y)
化简y(x+y)+(x+y)(x-y)-x^2
计算(x^8-x^7y+x^5y^3-x^4y^4+x^3y^5-x^y^7+y^8)(x^2+xy+y^2)
(x+y)(x-y)-(x-y)^2如题 (x+y)(x-y)-(x-y)^2
【2(x-y)(x-y)(x-y)-8(x-y)(x-y)(x+y)+6y(x-y)(x-y)]/2(x-y)(x-y)
化简3(x-y)-7(x--y)+2(y-x)
5x(x-y)+2y(x-y)
化简:5(x-y)+2(x+y)-3(x-y)
已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)
[(x-y)^2-(x+2y)(x-2y)]/y
（X+2Y)(5X-2Y)
(x+2y)(5x-2y)
4x+2y-5x-y
(2x-3y)-(5x-y)
(2X-3y)-(5x-y)