x^3y^3-5x^2y^2+7/2xy-2 其中x等于-1,y=1/2

x^3y(-4y)^2+(-7xy)^2*(-xy)-5xy^3*(-3x)^2 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 计算(x^8-x^7y+x^5y^3-x^4y^4+x^3y^5-x^y^7+y^8)(x^2+xy+y^2) 求（3x^+y^-5xy）-【2x^-（-4xy-y^+7x^）】=? 求（3x^+y^-5xy）-【2x^-（-4xy-y^+7x^）】=? 化简：3x^2-[5xy-(x^y-3xy)+4x^2y-8xy] 因式分解:12xy^2(y-x)+xy^3(x-y)+4x^2y(x-y) -x^5y-xy+2x^3y X^Y-2XY^2+y^3 3(x-y)²-7(x-y)+8(x-y)²+6(x-y)求详细过程（2） 5xy-4x²y-8xy²+3xy-xy²+4x²y x²-y²+5x+3y+4（x+y-2xy)(x+y-z)+(xy-1）² 已知xy^2=-2求xy（2x^3y^7+5x^2y 5x^3y*(-3y)^2+(-6xy)^2*(-xy)+xy^3*(-4x^2) x(y-x)-y(x-y) (-3xy)*5c^2Y+6x^2(7/2xy^2-2y^2) 化简：x-y/x+3y÷x^-y^2/x^2+6xy+9y^2-(xy/x+y) [x(x^2y^2-xy)-y(x^2-x^3y)]/3x^2y [x(x^2y^2-xy)-y(x^2-x^3y)]/3x^2y