What is the exact reciprocal of (3/4) (3/5).
(3/4)的倒数正好是多少的(3/5)．
<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">1 / (3/4) / (3/5)</gadget>
<output>20/9 = around 2.222222</output>

<result>20/9 = around 2.222222</result>