In (5/9), (4/11), (5/7), (4/13), what is the largest fraction
在(5/9)、(4/11)、(5/7)、(4/13)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>