A series of numbers (1/1), (2/3), (5/8), (13/21), ..., find the tenth fraction.
一列数(1/1)，(2/3)，(5/8)，(13/21)，…，求第十个分数是多少．
<gadget id="calculator">479 / 779</gadget>
<output>479/779 = around 0.614891</output>

<result>479/779 = around 0.614891</result>