Calculation: 19-0.6*0.6-0.64.
计算：19-0.6*0.6-0.64．
<gadget id="calculator">0.6 * 0.6</gadget>
<output>0.36</output>

<gadget id="calculator">19 - 0.36 - 0.64</gadget>
<output>18</output>

<result>18</result>