Among the following fractions: (4/25), (2/14), (9/16), (45/30), which ones cannot be reduced to finite decimals.
在下列分数：(4/25)，(2/14)，(9/16)，(45/30)中，不能化成有限小数的是多少．
<gadget id="calculator">2 / 14</gadget>
<output>1/7 = around 0.142857</output>

<result>1/7 = around 0.142857</result>