For a fraction, the numerator is equal to (2/3) after subtracting 1, and the numerator is equal to (1/2) after subtracting 2. What is the fraction?
一个分数，分子减1后等于(2/3)，分子减2后等于(1/2)，则这个分数是多少．
<gadget id="calculator">5 / 6</gadget>
<output>5/6 = around 0.833333</output>

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