What is the number obtained by dividing (1/2) of 9 from the reciprocal of (5/9)?
(5/9)的倒数去除9的(1/2)，得数是多少？
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">9 / 5</gadget>
<output>9/5 = around 1.8</output>

<gadget id="calculator">(1/2) / (9/5)</gadget>
<output>5/18 = around 0.277778</output>

<gadget id="calculator">9 * (5/18)</gadget>
<output>5/2 = around 2.5</output>

<result>5/2 = around 2.5</result>