If a fraction is added to one of its fractional units, the sum is 1; if one of its fractional units is subtracted, the difference is (6/7). What is this score.
一个分数若加上它的一个分数单位，和是1；若减去它的一个分数单位，差是(6/7)．这个分数是多少．
<gadget id="calculator">13 / 14</gadget>
<output>13/14 = around 0.928571</output>

<result>13/14 = around 0.928571</result>