A true fraction, add 1 to the numerator, the fraction value is 1, add 1 to the denominator, the fraction value is (3/4), what is the true fraction.
一个真分数，分子加上1，分数值就是1，分母加上1，分数值就是(3/4)，这个真分数是多少．
<gadget id="calculator">6 / 7</gadget>
<output>6/7 = around 0.857143</output>

<result>6/7 = around 0.857143</result>