Among the three fractions (5/9), (5/7), and (4/9), what is the largest fraction
在(5/9)、(5/7)、(4/9)三个分数中，最大的分数是多少
<gadget id="calculator">5 / 7</gadget>
<output>5/7 = around 0.714286</output>

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