9⼀20÷[2⼀7×(3⼀4-2⼀5)]简便运算?

2024-11-23 03:24:07
推荐回答(1个)
回答1:

9/20÷[2/7×(3/4-2/5)]
=9/20÷[2/7×7/20]
=9/20÷(1/10)
=(9/20) x10
=9/2