7.8÷[32×(1−5/8)+3.6]．
问题描述：
7.8÷[32×(1−
)+3.6]． 5 8
答
7.8÷[32×（1-
）+3.6]，5 8
=7.8÷[32×
+3.6]，3 8
=7.8÷[12+3.6]，
=7.8÷15.6，
=0.5．