A belongs to B (3/5), B belongs to C (2/3), A belongs to C ((())/(())).
甲是乙的(3/5)，乙是丙的(2/3)，甲是丙的((())/(()))．
<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">1 * (3/5)</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">1 / (2/3)</gadget>
<output>3/2 = around 1.5</output>

<gadget id="calculator">(3/5) / (3/2)</gadget>
<output>2/5 = around 0.4</output>

<result>2/5 = around 0.4</result>