(1⼀5+1⼀6)-(1⼀6-1⼀7)-(1⼀7-1⼀8)-(1⼀8-1⼀9)简便运算

2025-02-25 19:31:43
推荐回答(1个)
回答1:

(1/5+1/6)-(1/6-1/7)-(1/7-1/8)-(1/8-1/9)
=1/5+1/6-1/6+1/7-1/7+1/8-1/8+1/9
=1/5+1/9
=9/45+5/45
=14/45