x^2y-2x^2y^3-3x^3y等于多少?因式分解

若(x-y)/(x+y)=3 则(x+2y)/(6x-7y)等于 3y/x*x-y*y+x/x*x-2xy+y*y+6y*y/x*x*x-x*x*y-xy*y+y*y*y等于多少? 已知 2x-3y/y等于2 求x-y/2x 求x-3y/2x+y x(x-y)2-(y-x)3 (x+3y)(x-3y)-2y(x-y)等于几? [2/3x-2/x+y(x+y/3x-x-y)]/x-y/x 化简：{2/3x-2/(x+y)[(x+y)/3x-x-y]}/(x+y)/x 计算2/3x-2/x+y(x+y/3x-x-y)/x-y/x 化简3x-2/(x+y)[(x+y)/3x-x-y]÷(x-y)/x （4x-3y)(5x+2y)-2x(9x-5y) 等于多少 [(3x+y)(x-y)-(2x+3y)(x-y)]*(x-y) 计算：x+2y/x-y+2x/y-x-3y/x-y 化简:(x-3y)(x+y)-(x-2y)(x+2y)-(x-y)平方 (3x-2y)(2x-3y)等于? (3x-2y)(2x-3y)等于? （2x+3y)×(3x-2y)等于多少 (2x-3y)(3y+2x)等于多少? (2x+3y)(2x-3y)等于多少