(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

错了吧
是(3m+2n)²(3m-2n)²
=[(3m+2n)(3m-2n)]²
=(9m²-4n²)²
=81m⁴-72m²n²+16n⁴