(2x^2y-3xy^2)-(6x^2y-3xy^2)

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^2-xy-6y^2+3xy+y+2 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? 因式分解:12xy^2(y-x)+xy^3(x-y)+4x^2y(x-y) 2x^2+3xy+y^2+x-y-6 x^2+xy-6y^2-3x+6y x²+3xy+2y-x+y-6因式分解 X^Y-2XY^2+y^3 已知xy=-2,x-y=3,求（x+y)（x-y)-y^2+（x-y)^2-（6x^2y-2xy^2)÷2y 5x^3y*(-3y)^2+(-6xy)^2*(-xy)+xy^3*(-4x^2) (-x-y)(x^2+xy+y^2) 化简x^-y^/x^-2xy+y^ 2*(x-y)²(y-x)(xy) （x^2+xy/x-y)/（xy/x-y)计算 [x(x^2y^2-xy)-y(x^2-x^3y)]/(2x^2y)