①x^2+xy-2y^2+2x+7y-3 ②x^2-4xy+3y^2+2x-8y-3 ③x^2+2xy-8y^2+2x+14y-3分解因式

1、(-7x^y)(2x^y-3xy^3+xy) 2、((x-y)^6)/((y-x)^3)/(x-y) 因式分解:12xy^2(y-x)+xy^3(x-y)+4x^2y(x-y) X^Y-2XY^2+y^3 x^3y(-4y)^2+(-7xy)^2*(-xy)-5xy^3*(-3x)^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 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)]/(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 -2x(3x-7y)+(x-y)(x^2+xy+y^2） 计算 -xy^2(x+y)^3+x(x+y)^2因式分解 因式分解:8(x-2y)-x(7x+y)+xy. 已知xy/x+y=3,则代数式2x-7xy+2y/-x+xy-y的值是多少? (x+3y)/(x^2+xy)-x+y计算题