A fraction, adding 1 to the numerator is 1, and subtracting 2 from the numerator is (3/4). What is the fraction?
一分数，分子加1是1，分子减2后是(3/4)，这个分数是多少．
<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">1 - (3/4)</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">(1/4) / 3</gadget>
<output>1/12 = around 0.083333</output>

<gadget id="calculator">1 - (1/12)</gadget>
<output>11/12 = around 0.916667</output>

<result>11/12 = around 0.916667</result>