5⼀1-9⼀7+5⼀4计算步骤

5/1-9/7+5/4计算步骤
2025-04-07 22:18:16
推荐回答(2个)
回答1:

解:原式=5-9/7+4/5
=5-45/35+28/35
=175/35-45/35+28/35
=130/35+28/35
=158/35

回答2:

1/5-7/9+4/5
=(1/5+4/5)-7/9
=1-7/9
=2/9