What is the difference between the reciprocal of (4/9) and the reciprocal of 2?
(4/9)的倒数与2的倒数的差是多少．
<gadget id="calculator">4 / 9</gadget>
<output>4/9 = around 0.444444</output>

<gadget id="calculator">1 / (4/9)</gadget>
<output>9/4 = around 2.25</output>

<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">(9/4) - (1/2)</gadget>
<output>7/4 = around 1.75</output>

<result>7/4 = around 1.75</result>