化简[(x^2+y^2)^2-4x^2y^2]÷(x+y)^2,其中x=1,y=3/2
化简[(3x+4y)^2-(2x+y)(2x-y)+(-x+y)(5x-y)]除以-2y,其中x=-1,y=1
[x(x-y)-y(x-y)+(x+y)(x-y)]÷2x其中x=2012 y=2013
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
[(2x+y)^2+(y+2x)(y-2x)-2y(4x-y)]/4y,其中x=1/2,y=1/3
先化简,再求值:[(x+y)(x-y)-(x-y)^2+2y(x-3y)]/(-4y),其中x=1,y=-2
先化简,再求值(x-y/x+y)^2÷(y-x/x^2+2xy+y^2)^2*1/x+y,其中x=-4,y=1
[(y-2x)(-2x-y)-4(x-2y)²]*2y,其中x=1,y=2
化简:【(x-y)的2次方+(x+y)(x-y)】除以2x,其中x=3,y=1.5
(2x+y-1)(2x-y+1)-(3x+y)(3x-y),其中x=5分之1,
先化简,再求值[(2x+y)^2-(2x+y)(2x-y)-y(5x+y)]÷(1/2y),其中x-y=2
化简求值:[(x+y)(x-y)-(x-y)²+2y(x-y)]÷4y,其中x=二分之一,y=2
{3(x+y)-4(x-y)=4 {x+y/2 + x-y/6=1