化简 2a(1+x%)²-a(1-x%)²

问题描述:

化简 2a(1+x%)²-a(1-x%)²

2a(1+x%)²-a(1-x%)²
=2a(1+2x%+x%²)-a(1-2x%+x%²)
=2a+4ax%+2ax%²-a+2ax%-ax%²
=ax%²+6ax%+a
不懂的欢迎追问,