已知[(x²+y²)-(x-y)²+2y(x-y)]÷4y=1,求（4x/4x²

已知x²+y²+5=2x+4y,求【2x²-(x-y)(x-y)】【(x+y-1)(x-y 已知x/y=2,求2x(x+y)-y(x+y)/4x²-4xy+y² 已知x²+y²+5=2x+4y,求代数式（2x²-（x+y)(x-y))x((x+y-1) 已知{(x²+y²)-(x-y)²+2y(x-y)}÷4y=1,求4x²-y&# 已知2x-y=10,求代数式[（x²+y²）-（x-y）²+2y（x-y）]÷4y的值? 已知2x-y=10,求代数式[x²+y²-(x-y)²+2y(x-y)]÷4y的值 若|x+2y-1|+y²+4y+4=0,求（2x-y）²-2（2x-y)(x+2y)+(x+2y)& 已知2x-y=10,求式子[(x^2+y^2)-(x-y)^2+2y(x-y)]/4y (4xy-2y²)/4 已知x²+y²-2x+4y+5=0,求x+y 已知x² +y²+5/4=2x+y,求y-x的值 已知x²+4x+y-2y+5=0求x+2y 已知:【(x²+y²)-(x-y)²+2y(x-y)】/4y=1,求4x/4x²