计算:(x-2y)(x+y)-2y(1-4y)=
计算:1/(x-y)-1/(x+y)-2y/(x^2+y^2)-4y^3/(x^4+y^4)-8x^7/(x^8+y^8
计算(x-2y)^2-4(2x+y)(y-2x)+4x(y-2)
计算【3(x-y)^2(x+y)^-2/4(x+y)^2(x-y)^-2】^-2
计算(2x-3y)(x+4y)-(3x+y)(x-2y)
(x-3y)(y+2x)-(4y-3x)(3x+4y)计算
计算:(-x-2y) * (3x-y)
已知x=2+根号3,y=2-根号3,计算代数式(x+y/x-y-x-y/x+y)乘以(1/x^2-1/y^2)
{3(x+y)-4(x-y)=4 {x+y/2 + x-y/6=1
已知4x=9y求(1)x+y/y (2)y-x/2x
分解因式计算:x^2(x-y)+(y-x)=?x^3+x^2+1\4x=?(2x+y)^2-(x-2y)^2=?
计算:(x-y)^2*(y-x)^2*(x-y)^6
计算(x+y)(x+y)^2(-x-y)^3