Calculation: (22.5-5.5*3)/2.
计算：(22.5-5.5*3)/2．
<gadget id="calculator">5.5 * 3</gadget>
<output>16.5</output>

<gadget id="calculator">22.5 - 16.5</gadget>
<output>6</output>

<gadget id="calculator">6 / 2</gadget>
<output>3</output>

<result>3</result>