If the numerator of a fraction is reduced by 3 times and the denominator is enlarged by 3 times, the value of the fraction will be reduced by as many times as possible.
一个分数的分子缩小3倍，分母扩大3倍，分数值就缩小多少倍．
<gadget id="calculator">3 * 3</gadget>
<output>9</output>

<result>9</result>