17.2/[(3又五分之二-1.25)*三分之二]

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17.2/[(3又五分之二-1.25)*三分之二]
17.2/[(3又五分之二-1.25)*三分之二]

17.2/[(3又五分之二-1.25)*三分之二]
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

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