九分之八-十二分之七+四分之一,等于几?

2025-04-07 05:50:03
推荐回答(1个)
回答1:

先通分,再相加
8/9-7/12+1/4
=8/9-(7/12-1/4)
=8/9-(7/12-3/12)
=8/9-1/3
=8/9-3/9
=5/9