Arrange the four numbers (5/9), (7/8), (5/8), and (7/9) in ascending order, what is the third digit?
把(5/9)、(7/8)、(5/8)、(7/9)这四个数从小到大排列，第三位是多少．
<gadget id="calculator">5 / 8</gadget>
<output>5/8 = around 0.625</output>

<result>5/8 = around 0.625</result>