(3m+2n)²(3m+2n)²的详细步骤,类似这样的题要怎么做
问题描述:
(3m+2n)²(3m+2n)²的详细步骤,类似这样的题要怎么做
答
错了吧
是(3m+2n)²(3m-2n)²
=[(3m+2n)(3m-2n)]²
=(9m²-4n²)²
=81m⁴-72m²n²+16n⁴