Calculation: 1+9*8/4=
计算：1+9*8/4=
<gadget id="calculator">8 / 4</gadget>
<output>2</output>

<gadget id="calculator">9 * 2</gadget>
<output>18</output>

<gadget id="calculator">1 + 18</gadget>
<output>19</output>

<result>19</result>