已知x^2-y^2=12,x+y=6,求x^y-y^x的值.

已知x^2+y^2=12,x+y=6,求x、y的值. 已知X*X+Y*Y+6X-8Y+25=0 求（Y/X)+(X/Y)-2=? 已知x^2-y^2=12,x+y=6,求x^y-y^x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：2x+y=6,x-3y=1 求7y(x-3y)(x-3y)-2(3y-x)(3y-x) 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xy=-2,x-y=3,求（x+y)（x-y)-y^2+（x-y)^2-（6x^2y-2xy^2)÷2y 已知x^2+2x+y^2-6y+10=0 求（x+y)^2 已知x^2-y^2=6,x+y=3求x.y的值 已知x+y=-6,x-y=5,求x^2-y^2 已知:x^2-y^2=18,x+y=6,求x,y的值 已知x-y=2,x²-y²=6,求x、y的值 已知2/y-5/x=16,5/y+6/x=13,求x、y. 已知：x^2+y^2+4x-6y+13=0,求x^y值. 已知x-2y=2,求4x-y-8分之3x+y-6