化简：2x^2y+{2xy-[3x^2y-2(-3x^2y+2xy)]-4xy^2}

化简x^-y^/x^-2xy+y^ 化简：x-y/x+3y÷x^-y^2/x^2+6xy+9y^2-(xy/x+y) 化简：3x^2-[5xy-(x^y-3xy)+4x^2y-8xy] 化简2(x²y+xy)-3(x²y-xy)-4x²y 因式分解:12xy^2(y-x)+xy^3(x-y)+4x^2y(x-y) x^2y-2xy+y化简 X^Y-2XY^2+y^3 (-x-y)(x^2+xy+y^2) 化简：2x²y+{2xy-[3x²y-2(-3x²y+2xy)]-4xy}化简：2x²y+{2xy-[3x²y-2(-3x²y+2xy)]-4xy} 2*(x-y)²(y-x)(xy) （x^2+xy/x-y)/（xy/x-y)计算 1、(-7x^y)(2x^y-3xy^3+xy) 2、((x-y)^6)/((y-x)^3)/(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 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