(3x-y)(9x的2次方+y的2次方)(6x+2y)因式分解

问题描述:

(3x-y)(9x的2次方+y的2次方)(6x+2y)因式分解


原式
=(3x-y)(9x²+y²)×2(3x+y)
=2(3x-y)(9x²+y²)(3x+y)

(3x-y)(9x²+y²)(6x+2y)
=(3x-y)×2(3x+y)×(9x²+y²)
=2(9x²-y²)(9x²+y²)
=2(81x的4次方-y的4次方)