There is a simple true fraction whose product of numerator and denominator is 36. What is the maximum true score.
有一个最简真分数，它的分子和分母的积是36．这个真分数最大是多少．
<gadget id="calculator">4 / 9</gadget>
<output>4/9 = around 0.444444</output>

<result>4/9 = around 0.444444</result>