因式分解:x^2-x-9y^2-3y
问题描述:
因式分解:x^2-x-9y^2-3y
答
x^2-x-9y^2-3y
=( x^2-9y^2)-(x+3y)
=(x+3y)(x-3y)-(x+3y)
=(x+3y)(x-3y-1)
答
x^2-x-9y^2-3y
=(x^2-9y^2)-(x+3y)
=(x-3y)*(x+3y)-(x+3y)
=(x-3y-1)*(x+3y)
答
此题利用平方差公式得:
x^2-x-9y^2-3y
=(x+3y)(x-3y)-(x+3y)
=(x+3y)(x-3y-1)
答
2x-2-6y