[(x∨2+y∨2)-(x-y)∨2+2y(x-y)]÷4y+4,其中2x-y=18
[x(x-y)-y(x-y)+(x+y)(x-y)]÷2x其中x=2012 y=2013
化简求值:[(x+y)(x-y)-(x-y)²+2y(x-y)]÷4y,其中x=二分之一,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
化简[(3x+4y)^2-(2x+y)(2x-y)+(-x+y)(5x-y)]除以-2y,其中x=-1,y=1
「(x²+y²)-(x-y)²+2y(x-y)」÷4y,其中2x-y=18
[(y-2x)(-2x-y)-4(x-2y)²]*2y,其中x=1,y=2
2x-y=2,求[(x²+y²)-(x-y)²+2y(x-y)]÷4y
[(2x+y)^2+(y+2x)(y-2x)-2y(4x-y)]/4y,其中x=1/2,y=1/3
[(x+2y)²-(x+y)(3x-y)-5y²]÷(2x),其中x,y满足x²+4x+y
先化简,再求值:[(x+y)(x-y)-(x-y)^2+2y(x-3y)]/(-4y),其中x=1,y=-2
x^2-y^2/x+y-4x(x-y)+y^2/2x-y,
{(z+y)(x-y)-(x-y)的2次方+2y(x-y)}除以4y