(a-b+c)(a+b-c)要过程,有答必采纳!

2025-03-10 18:54:23
推荐回答(1个)
回答1:

(a-b+c)(a+b-c)
=[a-(b-c)]*[a+(b-c)]
=a²-(b-c)²
=a²-(b²-2bc+c²)
=a²-b²-c²+2bc