(3a+2b)눀-(a-b)눀

2025-03-07 06:38:26
推荐回答(2个)
回答1:

回答2:

=9a²+2×3a×2b+4b²-(a²-2ab+b²)
=9a²+12ab+4b²-a²+2ab-b²
=8a²+14ab+3b²