化简:x-y/x+3y÷x^2-y^2/x^2+6xy+9y^2-2y/x+y
化简:x-y/x+3y÷x^-y^2/x^2+6xy+9y^2-(xy/x+y)
化简:x-y/x+3y÷x^2-y^2/x^2+6xy+9y^2-2y/x+y
(x-2xy)*(-xy+2y*y)-(3x*x-2xy)(x-9xy+6y*y)
1、(-7x^y)(2x^y-3xy^3+xy) 2、((x-y)^6)/((y-x)^3)/(x-y)
已知xy=-2,x-y=3,求(x+y)(x-y)-y^2+(x-y)^2-(6x^2y-2xy^2)÷2y
[x(x^2y^2-xy)-y(x^2-x^3y)]/3x^2y
因式分解:x×x-xy-2y×y-x-y
(x+y)(x-y)-(2xy+3y)平方
急![(3x+y)²-3(3x-y)(x+y)-(x-3y)(x+3y)]÷(2xy)
x^8-x^7y+x^6y^2-x^5y^3+x^4y^4-x^3y^5+x^2y^-xy^7+y^8
化简:(x-3y)(x+y)-(x-2y)(x+2y)-(x-y)平方
9xy(x-y)(x+1)-3y(x-y)(3x+2y)+6y的平方(x-y)(x+1),因式分解