[(3x^2-1/2y^2)^2+(3x^2+1/2y^2)^2](18x^2-1/2y^4)
1、x(x-y)(x+y)-x(x+y)^2
(x+2)(x+3) (x-4)(x+1) (y+4)(y-2) (y-5)(y-3)
(1)(x^2/x)-y-x-y
{3(x+y)-4(x-y)=4 {x+y/2 + x-y/6=1
因式分解 (1)6(x-y)^3-3y(y-x)^2 (2)x(x-y)(a-b)-y(y-x)(
[(-x-y)(-x+y)-(x+y)^2-x(y-y^2)}÷1/2y
先化简再求值(x-y)(x+y)-(x-2y) 的完全平方+x(3x-5y)-(x-y)(x-2y),其中x=1/2 y
化简[(3x+4y)^2-(2x+y)(2x-y)+(-x+y)(5x-y)]除以-2y,其中x=-1,y=1
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
(3x-y)^2+(3x+y)(3x-y),x=1,y=-2
已知x=1/3,y=-1/2,求代数式x-(x+y)+(x+2y)-(x+3y)+(x+4y)-(x+5y)+...-(
1) (2x+5y)(2x-5y)(-4x^2-25y^2) 2) [(x+y)(x-y)-(x-y)^2+2y(x-y