x²=4y x+12=2y

4/X+1/Y=2,XY=-1,求代数式4Y-X/X-2Y/（x+2y-12Y²/x-2y)的值 已知x/y=2,求2x(x+y)-y(x+y)/4x²-4xy+y² x²+4y²-2x+12y+10=0求X,Y值 已知x²+y²+5=2x+4y,求【2x²-(x-y)(x-y)】【(x+y-1)(x-y [(y-2x)(-2x-y)-4(x-2y)²]*2y,其中x=1,y=2 若|x+2y-1|+y²+4y+4=0,求（2x-y）²-2（2x-y)(x+2y)+(x+2y)& 已知2x-y/x+3y=2,求代数式4x-2y/x+3y减4x+12y除以2x-y 已知2x-y/x+3y=2,求代数式4x-2y/x+3y减4x+12y/2x-y的值 已知X.x+y.y-4x+2y+5=0,求4X.X-12X Y+9Y.y的值 已知x²+y²+5=2x+4y,求代数式（2x²-（x+y)(x-y))x((x+y-1) 已知2x-y=10,求式子[(x^2+y^2)-(x-y)^2+2y(x-y)]/4y (4xy-2y²)/4 {3(x+y)-4(x-y)=4 {x+y/2 + x-y/6=1