(a+b-c)(a-b+c)

2025-03-26 22:09:16
推荐回答(1个)
回答1:

(a+b-c)(a-b+c)
=(a+(b-c))(a-(b-c))
=a^2-(b-c)^2
=a^2-(b^2-2bc+c^2)
=a^2-b^2-c^2+2bc.