（x+2y-3y)- (-2x-y+xy ) 其中x+y=0.5 xy等于-0.5

因式分解:12xy^2(y-x)+xy^3(x-y)+4x^2y(x-y) X^Y-2XY^2+y^3 [x(x^2y^2-xy)-y(x^2-x^3y)]/3x^2y [x(x^2y^2-xy)-y(x^2-x^3y)]/3x^2y [x(x^2y^2-xy)-y(x^2-x^3y)]/(2x^2y) 1、(-7x^y)(2x^y-3xy^3+xy) 2、((x-y)^6)/((y-x)^3)/(x-y) 化简：x-y/x+3y÷x^-y^2/x^2+6xy+9y^2-(xy/x+y) (-x-y)(x^2+xy+y^2) 化简x^-y^/x^-2xy+y^ 2*(x-y)²(y-x)(xy) 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 x-xy+3y-3x 2x+xy-y-4x+5y-6 -xy^2(x+y)^3+x(x+y)^2因式分解 (x+3y)/(x^2+xy)-x+y计算题 (x+y)(x-y)-(2xy+3y)平方平方是(2xy+3y)的 (-x+2y)(2x+y)-(2x+y)(y-2x)-3xy=?因式分解 x*x+xy=3,xy+y*y=2,则x*x+2xy+y*y=________? x+y=-3 xy+x+y=-2 x/y+y/x=?