3x^2y-3y^2x+2xy^2-2x^y,其中x=1/2,y=-1有谁知道?

因式分解:12xy^2(y-x)+xy^3(x-y)+4x^2y(x-y) [x(x^2y^2-xy)-y(x^2-x^3y)]/(2x^2y) [x(x^2y^2-xy)-y(x^2-x^3y)]/3x^2y [x(x^2y^2-xy)-y(x^2-x^3y)]/3x^2y -xy^2(x+y)^3+x(x+y)^2因式分解 (x+3y)/(x^2+xy)-x+y计算题 因式分解 x-xy+3y-3x 2x+xy-y-4x+5y-6 1、(-7x^y)(2x^y-3xy^3+xy) 2、((x-y)^6)/((y-x)^3)/(x-y) (x-2xy)*(-xy+2y*y)-(3x*x-2xy)(x-9xy+6y*y)答案应为-2x-x*x-3x， 化简：x-y/x+3y÷x^-y^2/x^2+6xy+9y^2-(xy/x+y) X^Y-2XY^2+y^3 x*x+xy=3,xy+y*y=2,则x*x+2xy+y*y=________? (-x+2y)(2x+y)-(2x+y)(y-2x)-3xy=?因式分解 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=-3 xy+x+y=-2 x/y+y/x=? (x^3-2x^2+xy^2)/(x-y)+(x+y)(y-x)=? x²/xy-x/y 3x/4x+y - x-2y/4x+y (1-y/y+x)÷x/y²-x² 化简：3x^2-[5xy-(x^y-3xy)+4x^2y-8xy]