(n-m)×(m-n)是多少,过程

2025-05-20 19:39:22
推荐回答(1个)
回答1:

(n-m)×(m-n)
= -(m-n)×(m-n)
=-(m-n)²
= -(m²-2mn+n²)
= -m²+2mn-n²