A simple fraction, if 1 is added to the numerator, it can be reduced to (3/4); if 1 is subtracted from the numerator, it can be reduced to (1/2). What is the simplest fraction?
一个最简分数，若分子加上1，就能约成(3/4)；若分子减去1，就能约成(1/2)，这个最简分数是多少．
<gadget id="calculator">6 - 1</gadget>
<output>5</output>

<gadget id="calculator">5 / 8</gadget>
<output>5/8 = around 0.625</output>

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