19.98*37-199.8*1.9+1.998*820=how much.
19.98*37-199.8*1.9+1.998*820=多少．
<gadget id="calculator">19.98 * 37</gadget>
<output>739.26</output>

<gadget id="calculator">199.8 * 1.9</gadget>
<output>379.62</output>

<gadget id="calculator">739.26 - 379.62</gadget>
<output>359.64</output>

<gadget id="calculator">1.998 * 820</gadget>
<output>1_638.36</output>

<gadget id="calculator">359.64 + 1_638.36</gadget>
<output>1_998</output>

<result>1_998</result>