因式分解: x^2-3x+6xy+9y^2-9y
问题描述:
因式分解: x^2-3x+6xy+9y^2-9y
答
x^2-3x+6xy+9y^2-9y
=(x+3y)^2-3(x+3y)
=(x+3y)(x+3y-3)