7.54-(3.54-1.49)=how much
7.54-(3.54-1.49)=多少
<gadget id="calculator">3.54 - 1.49</gadget>
<output>2.05</output>

<gadget id="calculator">7.54 - 2.05</gadget>
<output>5.49</output>

<result>5.49</result>