(23.4+18.6)÷(23.4-18.6)的简便计算!%>_
问题描述：
(23.4+18.6)÷(23.4-18.6)的简便计算!%>_
答
(23.4+18.6)/(23.4-18.6)
=(39+31)/(39-31)
=70/8
=8.75
答
=23.4÷23.4－18.6÷18.6
答
（23.4+18.6）÷(23.4-18.6)
=42÷4.8
=8.57