递等式计算,能简算的简算,5⼀7+1⼀9+8⼀9,11⼀4-7⼀11-4⼀11,3-8⼀5+5⼀8

2025-02-02 02:59:16
推荐回答(1个)
回答1:

5/7+1/9+8/9
=5/7+(1/9+8/9)
=5/7+1
=12/7

11/4-7/11-4/11
=11/4-(7/11+4/11)
=11/4-1
=7/4

3-5/8+5/8
=3+(5/8-5/8)
=3

6-1/5-1/5
=6-(1/5+1/5)
=6-2/5
=28/5