(m^2-mn+n^2)的平方-(m^2+mn+n^2)的平方

在线等急
2025-06-28 00:03:00
推荐回答(1个)
回答1:

=(m²-mn+n²-m²-mn-n²)(m²-mn+n²+m²+mn+n²)=-2mn(2m²+2n²)=-4mn(m²+n²)