5⼀12-6⼀15 7⼀12-7⼀15等于几分之几?

2024-11-16 05:25:02
推荐回答(1个)
回答1:

5/12-6/15+7/12-7/15
=(5/12+7/12)-(6/15+7/15)
=1-13/15
=2/15