There is a string of fractions, as follows: (1/2), (1/3), (2/3), (1/4), (2/4), (3/4), (1/5), (2/5), (3/5), (4/5) (each fraction is separated by a comma)..., then what is the 1999th fraction.
有一串分数，按如下规律：(1/2)，(1/3)，(2/3)，(1/4)，(2/4)，(3/4)，(1/5)，(2/5)，(3/5)，(4/5)(每个分数中间用逗号隔开)…，那么第1999个分数是多少．
<gadget id="calculator">1_999 - 1_953</gadget>
<output>46</output>

<gadget id="calculator">46 / 64</gadget>
<output>23/32 = around 0.71875</output>

<result>23/32 = around 0.71875</result>