3.17+7.48-2.38+0.53-3.48-1.62+53=how much.
3.17+7.48-2.38+0.53-3.48-1.62+53=多少．
<gadget id="calculator">7.48 - 3.48</gadget>
<output>4</output>

<gadget id="calculator">2.38 + 1.62</gadget>
<output>4</output>

<gadget id="calculator">4 - 4</gadget>
<output>0</output>

<gadget id="calculator">3.8 + 0 + 53</gadget>
<output>56.8</output>

<result>56.8</result>