已知2x-y=10,求式子[(x^2+y^2)-(x-y)^2+2y(x-y)]/4y (4xy-2y²)/4

已知2x-y=10,求式子[(x^2+y^2)-(x-y)^2+2y(x-y)]/4y (4xy-2y²)/4 已知x/y=2,求2x(x+y)-y(x+y)/4x²-4xy+y² 已知x*x-4xy+4y*y=0 求[2x(x+y)-y(x+y)]/(4x*x-4xy+y*y)的值? 已知3x^2+xy-2y^2=0,求{(x+y)/(x-y)+4xy/(y^2-x^2)}/{(x+3y)*(x-y)} 已知2x-y=10,求[(x²+y²)-(x-y)²+2y(x-y)]/4y 已知2x-y=10,求式子[(x^2+y^2)-(x-y)^2+2y(x-y)]/4y 已知x²+y²-2x+4y+5=0,求X^4-y^4/2x^2+xy-y²·2x-y/xy 已知y-2x=10，求[2y（x-y）-（x-y）2+（x+y）2-2xy]÷4y的值． 已知x,y>0 2x+y+3=xy 求5x+4y最小值 已知4x=9y求(1)x+y/y (2)y-x/2x 已知2x-y=2014,求式子[(x^2+y^2)-(x-y)^2+2y(x-y)]/4y 已知2x-y=4022 求式子[(x的平方+y的平方)-(x-y)的平方+2y(x-y)]除4y的值