分解因式 x²-x-9y²-3y

问题描述:

分解因式 x²-x-9y²-3y

x²-x-9y²-3y
=(x^2-9y^2)-(x+3y)
=(x-3y)(x+3y)-(x+3y)
=(x+3y)(x-3y-1)

x^2-9y^2-(x+3y)
=(x+3y)(x-3y)-(x+3y)
=(x+3y)(x-3y-1)