If 1 is added to the numerator of a simplest fraction, the fraction becomes (1/2). If 2 is subtracted from the denominator, the fraction becomes (1/2). What is the simplest fraction?
一个最简分数若分子加上1，这个分数就变成了(1/2)，如果分母减2，这个分数就变成了(1/2)，请问这个最简分数是多少？
<gadget id="calculator">1 + 1</gadget>
<output>2</output>

<gadget id="calculator">2 * 2</gadget>
<output>4</output>

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<result>1/4 = around 0.25</result>