(5⼀3-1⼀2-7⼀12)*(60*3⼀7-60*1⼀7+60*5⼀7)解题思路

2024-12-04 18:43:41
推荐回答(2个)
回答1:

原式=(5/3-1/2-7/12)×60×(3/7-1/7+5/7)
=(5/3-1/2-7/12)×60×1
=5/3×60-1/2×60-7/12×60
=5×20-30-7×5
=35

回答2:

[20/12-6/12-7/12]*[60*[3/7-1/3+5/7]]=7/12*60=5*7=35