In (9/10), (7/9), (3/8), (5/7), which fraction unit is the largest.
在(9/10)、(7/9)、(3/8)、(5/7)中，多少的分数单位最大．
<gadget id="calculator">7 / 1</gadget>
<output>7</output>

<gadget id="calculator">5 / 7</gadget>
<output>5/7 = around 0.714286</output>

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