For a fraction, the numerator minus 1 equals (1/3), and the denominator minus 1 equals (1/2). Find this fraction.
一个分数，分子减1等于(1/3)，分母减1等于(1/2)，求这个分数．
<gadget id="calculator">4 / 9</gadget>
<output>4/9 = around 0.444444</output>

<result>4/9 = around 0.444444</result>