19⼀7-(8⼀9+6⼀7),3-(11⼀15+3⼀4)简便计算

2024-11-22 09:48:26
推荐回答(1个)
回答1:

19/7-(8/9+6/7)
=19/7-6/7-8/9
=13/7-8/9
=61/63

3-(11/15+3/4)
=3-1又29/60
=1又31/60