Clever calculation: 13.4+0.45-13.4+0.35.
巧算：13.4+0.45-13.4+0.35．
<gadget id="calculator">0.45 - 13.4</gadget>
<output>-12.95</output>

<gadget id="calculator">13.4 + (-12.95) + 0.35</gadget>
<output>0.8</output>

<result>0.8</result>