How many fractions (7/15), (9/20), (13/30) can be transformed into finite decimals
分数(7/15)、(9/20)、(13/30)能化成有限小数的是多少
<gadget id="calculator">9 / 20</gadget>
<output>9/20 = around 0.45</output>

<result>9/20 = around 0.45</result>