(5⼀18-9⼀20)⼀(1⼀4-1⼀8)简便计算快快

2025-02-25 18:02:18
推荐回答(1个)
回答1:

(5/18-9/20)/(1/4-1/8)
=(5/18-9/20)/(1/8)
=(5/18-9/20)×8
=5/18×8-9/20×8
=20/9-18/5
=(100-162)/45
=-62/45