3⼀5 ÷(4⼀5+5⼀8×6⼀15) 能用简便方法计算吗?

2024-11-08 14:55:29
推荐回答(1个)
回答1:

3/5 ÷ (4/5 + 5/8 × 6/15)
= 3/5 ÷ (4/5 + 1/4)
= 3/5 ÷ (21/20)
= 3/5 × 20/21
= 4/7