已知x^2-y^2=8,x-y=2,求(x+y)^2的值.

已知X*X+Y*Y+6X-8Y+25=0 求（Y/X)+(X/Y)-2=? 已知x+y/y=11/8,求x-y/x+2y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-y=3,求[（x+y)(x-y)-(x-y)^2+2y(x-y)]除以的值 已知3x =2y 求x/x+y+y/x-y-y²/x²-y² 已知|x|=2,|y|=3,|x+y|=-(x+y)求x-y 已知x≠y,x^2-x=y^2-y,求x+y的值. 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x+y=8,x-y=2,求x²+y²的值 已知x-y=8,x-y=2,求x+y的值 已知(x+y)(x+y-2)-8=0,求x+y的值 已知（x+y）×（x+y+2）-8=0,求x+y的值 已知x+y=a,2x-y=-2a,求[（x/y-y/x)/(x+y)-x(1/x-1/y)]/[(x+1)/y]的值 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2/x+2/y=根号24,求 x/y(x-y) - y/x(x-y)的值