((11.9-8.4*1)-2)/1.3.
((11.9-8.4*1)-2)/1.3．
<gadget id="calculator">8.4 * 1</gadget>
<output>8.4</output>

<gadget id="calculator">11.9 - 8.4</gadget>
<output>3.5</output>

<gadget id="calculator">3.5 - 2</gadget>
<output>1.5</output>

<gadget id="calculator">1.5 / 1.3</gadget>
<output>1.153846</output>

<result>1.153846</result>