一道计算题 (2n-3m)²(2n+3m)²
问题描述:
一道计算题 (2n-3m)²(2n+3m)²
答
(2n-3m)²(2n+3m)²
=[(2n-3m)(2n+3m)]²
=[4n²-9m²]²
=16n^4-72m²n²+81m^4