2x^2+3xy-2y^2+7y-y+3 因式分解

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