(6.5-6.5)*((10-3.5)/6.5)/1.8=how much.
(6.5-6.5)*((10-3.5)/6.5)/1.8=多少．
<gadget id="calculator">6.5 - 6.5</gadget>
<output>0</output>

<gadget id="calculator">10 - 3.5</gadget>
<output>6.5</output>

<gadget id="calculator">6.5 / 6.5</gadget>
<output>1</output>

<gadget id="calculator">1 / 1.8</gadget>
<output>0.555556</output>

<gadget id="calculator">0 * 0.555556</gadget>
<output>0</output>

<result>0</result>