(3a+2b)²-(3a-4b)²怎么做?
问题描述:
(3a+2b)²-(3a-4b)²怎么做?
答
=3a²+2b²-3a²+4b²
=2b²+4b²
=6b²
(3a+2b)²-(3a-4b)²怎么做?
=3a²+2b²-3a²+4b²
=2b²+4b²
=6b²