A=(3/4), B is the reciprocal of A, and A is B's ((())/(())).
A=(3/4)，B是A的倒数，A是B的((())/(()))．
<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">1 / (3/4)</gadget>
<output>4/3 = around 1.333333</output>

<gadget id="calculator">(3/4) / (4/3)</gadget>
<output>9/16 = around 0.5625</output>

<result>9/16 = around 0.5625</result>