Among the fractions (4/15), (5/12) and (1/3), what is the smallest fractional unit
在分数(4/15)，(5/12)和(1/3)中，分数单位最小的一个是多少
<gadget id="calculator">4 / 15</gadget>
<output>4/15 = around 0.266667</output>

<result>4/15 = around 0.266667</result>