How many fractions (8/15), (7/40), (3/12), (17/25) cannot be reduced to finite decimals.
在分数(8/15)、(7/40)、(3/12)、(17/25)中不能化成有限小数的有多少．
<gadget id="calculator">8 / 15</gadget>
<output>8/15 = around 0.533333</output>

<result>8/15 = around 0.533333</result>