Among the three numbers (5/7), (5/8) and (4/9), what is the largest number?
(5/7)、(5/8)和(4/9)三个数中，最大的数是多少．
<gadget id="calculator">5 / 7</gadget>
<output>5/7 = around 0.714286</output>

<result>5/7 = around 0.714286</result>