(a-b+1)(a+b-1)是怎么计算的?

2025-03-11 00:13:01
推荐回答(1个)
回答1:

(a-b+1)(a+b-1)
=[a-(b-1)]*[a+(b-1)]
=a²-(b-1)²
=a²-b²+2b-1