Among the three fractions (4/7), (8/9) and (5/6), which fraction unit is the largest.
在(4/7)、(8/9)、(5/6)三个分数中，多少的分数单位最大．
<gadget id="calculator">6 / 1</gadget>
<output>6</output>

<gadget id="calculator">5 / 6</gadget>
<output>5/6 = around 0.833333</output>

<result>5/6 = around 0.833333</result>