Xiaohong said: "Two composite numbers whose common factor is only 1, and their least common multiple is 72." Guess what is the simplest true fraction composed of these two numbers.
小红说："公因数只有1的两个合数，它们的最小公倍数是72．"猜一猜，这两个数组成的最简真分数多少．
<gadget id="calculator">8 / 9</gadget>
<output>8/9 = around 0.888889</output>

<result>8/9 = around 0.888889</result>