Calculate with a simple method: 999.9*0.28-0.6666*370.
用简便方法计算：999.9*0.28-0.6666*370．
<gadget id="calculator">999.9 * 0.28</gadget>
<output>279.972</output>

<gadget id="calculator">0.6666 * 370</gadget>
<output>246.642</output>

<gadget id="calculator">279.972 - 246.642</gadget>
<output>33.33</output>

<result>33.33</result>