9/((38.02+1.98)*0.5).
9/((38.02+1.98)*0.5)．
<gadget id="calculator">38.02 + 1.98</gadget>
<output>40</output>

<gadget id="calculator">40 * 0.5</gadget>
<output>20</output>

<gadget id="calculator">9 / 20</gadget>
<output>9/20 = around 0.45</output>

<result>9/20 = around 0.45</result>