For a fraction, the numerator is expanded to 4 times of the original, and the denominator is expanded to 3 times of the original, the result at this time is (1/2), then what is the original fraction.
一个分数，分子扩大到原来的4倍，分母扩大到原来的3倍，此时的结果是(1/2)，那么原来的分数是多少．
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">(1/2) * (3/4)</gadget>
<output>3/8 = around 0.375</output>

<result>3/8 = around 0.375</result>