X-9y/6xy^2-x+3y/9x^2y
化简:x-y/x+3y÷x^-y^2/x^2+6xy+9y^2-(xy/x+y)
(x-2xy)*(-xy+2y*y)-(3x*x-2xy)(x-9xy+6y*y)
9xy(x-y)(x+1)-3y(x-y)(3x+2y)+6y的平方(x-y)(x+1),因式分解
1、(-7x^y)(2x^y-3xy^3+xy) 2、((x-y)^6)/((y-x)^3)/(x-y)
化简:x-y/x+3y÷x^2-y^2/x^2+6xy+9y^2-2y/x+y
因式分解:x^2-6xy+9y^2+x^2y-9y^3
2 21.(2x+3y) -(x+2y) 2 2 2 22.3|x-3|+x -6xy+9y =0 则x y+2xy=?
x*-2xy+3y*=9 4x*-5xy+6y*=30
2x方-3x-6xy+9y
数学题(x+y+3)(x^2+y^2+2xy-3x-3y+9)
计算:1.(x-1)^2+2(1-x) 2.(x-y)/(x+3y)÷(x^2-y^2)/(x^2+6xy+9y^2)-
因式分解:4a^2(x-y)+9(y-x) -4x^2y^2+x^3y+4xy^3