For a true fraction, its denominator is enlarged by 5 times, and its numerator is reduced by 4 times. After simplification, it is (1/52). What is the simplest true fraction?
一个真分数，把它的分母扩大5倍，而分子缩小4倍，化简后是(1/52)，求这个最简真分数是多少．
<gadget id="calculator">1 / 52</gadget>
<output>1/52 = around 0.019231</output>

<gadget id="calculator">4 * 5</gadget>
<output>20</output>

<gadget id="calculator">(1/52) * 20</gadget>
<output>5/13 = around 0.384615</output>

<result>5/13 = around 0.384615</result>