For a fraction, if 1 is added to the numerator and the denominator remains unchanged, then the fraction value is (2/3); if 1 is added to the denominator and the numerator remains unchanged, the fraction value is (1/2). What is the original score.
一个分数，如果分子加上1，分母不变，则分数值为(2/3)；如果分母加上1，分子不变，则分数值为(1/2)．原来这个分数是多少．
<gadget id="calculator">5 / 9</gadget>
<output>5/9 = around 0.555556</output>

<result>5/9 = around 0.555556</result>