括号2⼀15 1⼀12括号乘以3加 3⼀5等于多少?

2025-03-10 18:45:41
推荐回答(1个)
回答1:

(2/15 +1/12)x3+3/5
=3x2/15 +3x1/12+3/5
=2/5+1/4+3/5
=(2/5+3/5)+1/4
=1+1/4
=5/4