已知x/y=2,求2x(x+y)-y(x+y)/4x²-4xy+y²

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^4-y^4/2x^2+xy-y²·2x-y/xy 已知x²+y²-8x+6y+25=0,求（x-y+4xy/x-y）（x+y-4xy/x+y） 已知3x^2+xy-2y^2=0,求{(x+y)/(x-y)+4xy/(y^2-x^2)}/{(x+3y)*(x-y)} 已知x/y=2,求2x(x+y)-y(x+y)/4x²-4xy+y²的值 已知x/y=2,求2x(x+y)-y(x+y)/4x²-4xy+y² 快救救我~ 已知X²+Y²+X²Y²-4XY+1=0 求:（X-Y)^2008-(XY)^2 已知2x+y=0,求x-2y/x²+xy*(x²-y²）/x²-4xy+4y&# 已知2x+y=0,求x-2y/x²+xy乘(x²-y²)÷x²-4xy+4y&# 2x+y=0,求4x²+2xy(x+y)+y³