1⼀12 1⼀13 1⼀14 1⼀15等于几分之几。

2024-12-31 04:33:05
推荐回答(1个)
回答1:

1/12 +1/13+ 1/14+ 1/15
=455/5460+420/5460+390/5460+364/5460
=(455+420+390+364)/5460
=1629/5460
=543/1820