已知x-y=3,求[（x+y)(x-y)-(x-y)^2+2y(x-y)]除以的值

已知|3x-y|+|x+y|=0,求x-y除以x*y的值. 已知x-y除以x+y=3,求代数式x+y分之2（x-y)-3(x-y)分之x+y的值. 已知x-2y=2016,求[(3x+2y)(3x-2y)-(x+2y)(5x-2y)]除以8x的值 已知2x-y除以x+y等于2,求代数式(4x-2y除以x+y)-(4x+4y除以2x-y)的值 已知X-Y/X+Y=3,求代数式2(x-y)/X+Y-3X+Y/X+Y 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除以x+2y等于三分之一,求x-2y除以x+y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2/x+2/y=根号24,求 x/y(x-y) - y/x(x-y)的值 已知2/x 2/y=根号24,求 x/y(x-y) - y/x(x-y)的值 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=10,求【（x^2+y^2(-(x-y)^2+2y(x-y)】除以y的值