17.2/[(3又五分之二-1.25)*三分之二]
问题描述：
17.2/[(3又五分之二-1.25)*三分之二]
答
17.2/[(3又五分之二-1.25)*三分之二]
=17.2÷[2.15×2/3]
=17.2÷43/30
=17.2×30/43
=12
答
17.2/[(3又五分之二-1.25)*三分之二]
=17.2/[（17/5-5/4）*2/3]
=17.2/(43/20*2/3)
=17.2/(43/30)
=12