4⼀5+5⼀6-(4⼀15-1⼀10)简便算法

2025-03-01 03:27:56
推荐回答(1个)
回答1:

①(4/5+1/6-4/15)×30
=4/5 *30 + 30*1/6 -30 *4/15
=24+5-8
=21
②(1/2+1/4)÷(2/5-1/10)
=3/4 ÷ 3/10 = 10÷4=2.5
X/3 -1/3=1, X/3=4/3 X=4