已知2x+2y=-8,4x+y=15求（x-y)^-(3x+2y)^

已知2x+2y=-8,4x+y=15求（x-y)^-(3x+2y)^ 已知x^2+4y^2-4x+8y+8=0,求x+y 已知x-2y=2,求4x-y-8分之3x+y-6 已知实数x.y满足根号(x+y-8)+根号(8-x-y)=根号(3x-y-4)+根号(x-2y+7),求x,y 已知2y-x=-3,求[4y(2x-y)-2x(2x-y)]/(2x-y 已知X*X+Y*Y+6X-8Y+25=0 求（Y/X)+(X/Y)-2=? 已知x/y=2,求2x(x+y)-y(x+y)/4x²-4xy+y² 已知x+y/y=11/8,求x-y/x+2y的值. 已知x*x-4xy+4y*y=0 求[2x(x+y)-y(x+y)]/(4x*x-4xy+y*y)的值? 已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y) 已知x+y/x=11/8,求x-y/x+2y的值 已知x.x+y.y+8x+6y+25=0,求代数式(x.x-4y.y)/(x.x+4xy+4y.y)-x/(x+2y)的值 已知(x+2y)(2x-3y)=y(y-4x),试求x/y的值 已知:【(x²+y²)-(x-y)²+2y(x-y)】/4y=1,求4x/4x²-y²-1/2x+y 已知x-y=1,求[(x+2y)^2+(2x+y)(x-4y)-3(x+y)(x-y)]除以y的值大神们帮帮忙 已知x求^2+y^2-6x-8y+25=0求1/x-y /x+y/x^4-y^4 已知x-y=1,求[(x+2y)²+(2x+y)(x-4y)-3(x+y)(x-y)]÷y的值 已知x=3分之一,y=-2分之一,求代数式x-(x+y)+(x+2Y)-(x+3y)+(x+4y)...-(x+2009y)