7⼀8-(1⼀3+1⼀4)=多少用简便算法

2025-05-22 10:10:19
推荐回答(1个)
回答1:

解:采用结合律,
原式=7/8-(1/3+1/4)
=7/8-1/4-1/3
=7/8-2/8-1/3
=5/8-1/3
=15/24-8/24
=7/24