x^2-6xy+9y^2-3x+9y+2 越快越好!
(x-2xy)*(-xy+2y*y)-(3x*x-2xy)(x-9xy+6y*y)
化简:x-y/x+3y÷x^-y^2/x^2+6xy+9y^2-(xy/x+y)
9xy(x-y)(x+1)-3y(x-y)(3x+2y)+6y的平方(x-y)(x+1),因式分解
x*-2xy+3y*=9 4x*-5xy+6y*=30
1、(-7x^y)(2x^y-3xy^3+xy) 2、((x-y)^6)/((y-x)^3)/(x-y)
2x方-3x-6xy+9y
化简:x-y/x+3y÷x^2-y^2/x^2+6xy+9y^2-2y/x+y
2 21.(2x+3y) -(x+2y) 2 2 2 22.3|x-3|+x -6xy+9y =0 则x y+2xy=?
因式分解:x^2-6xy+9y^2+x^2y-9y^3
x^2-xy-6y^2+3xy+y+2
数学题(x+y+3)(x^2+y^2+2xy-3x-3y+9)
化简求值:根号x^-2xy+y^2 + x^2 -6xy+9y^2/x-3y,其中x=根号3,y=根号5