2x^2-3xy+6y^2-x^2+4xy-5y^2

(x-2xy)*(-xy+2y*y)-(3x*x-2xy)(x-9xy+6y*y) x^3y(-4y)^2+(-7xy)^2*(-xy)-5xy^3*(-3x)^2 x^2-xy-6y^2+3xy+y+2 （xy-x^2)乘以(xy)/(x-y) 5xy^2-[3xy^2-(4xy^2-2x^y)]+x^2y-xy^2如何化简 x*-2xy+3y*=9 4x*-5xy+6y*=30 （-3x^y+2xy)-( )=4x^+xy 因式分解 求过程 x-xy+3y-3x 2x+xy-y-4x+5y-6 x+y=8,xy=-2,求(5xy+4x+7y)+(6x-3xy)-(4xy-3y)的值 x^+2xy+y^+4=16 x^-2xy+y^=16 求(3xy+6y^)+|x^-(2xy+2y^-3x^)|的值 -3(xy-2x²)-[y²-(5xy-4x²)+2xy] [-(x-y)^2/xy]^-4*(y^2-xy/x)^3*(x^4/y^10)÷(xy-y^2/x)^-5=-y(y-