1/2.5+2.5*0.4+1.
1/2.5+2.5*0.4+1．
<gadget id="calculator">1 / 2.5</gadget>
<output>0.4</output>

<gadget id="calculator">2.5 * 0.4</gadget>
<output>1</output>

<gadget id="calculator">0.4 + 1 + 1</gadget>
<output>2.4</output>

<result>2.4</result>