-2x^+xy+y^-6x-y-2^ 这个符号相当于平方打错了…… 6x应该改为5x

化简：x-y/x+3y÷x^-y^2/x^2+6xy+9y^2-(xy/x+y) 1、(-7x^y)(2x^y-3xy^3+xy) 2、((x-y)^6)/((y-x)^3)/(x-y) 因式分解 x-xy+3y-3x 2x+xy-y-4x+5y-6 (x-2xy)*(-xy+2y*y)-(3x*x-2xy)(x-9xy+6y*y)答案应为-2x-x*x-3x， (-x-y)(x^2+xy+y^2) 化简x^-y^/x^-2xy+y^ 2*(x-y)²(y-x)(xy) x^2-xy-6y^2+3xy+y+2 （x^2+xy/x-y)/（xy/x-y)计算 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? X-Y/2X+2Y XY/X+Y² 因式分解：x×x-xy-2y×y-x-y x^2+xy-6y^2-3x+6y x^2+xy-6y^2+x+13y-6 2x^2+3xy+y^2+x-y-6 x^2-xy-2y^2+x+7y-6 分解因式(2x^-xy-6y^)-x+2y x²+3xy+2y-x+y-6因式分解