2a(b-c)²-3b+3c=
问题描述:
2a(b-c)²-3b+3c=
答
2a(b-c)²-3b+3c
=2a(b-c)²-3(b-c)
=(b-c)[2a(b-c)-3]
=(b-c)(2ab-2ac-3)