1990*2.8+199*51+1.99*2100.
1990*2.8+199*51+1.99*2100．
<gadget id="calculator">1_990 * 2.8</gadget>
<output>5_572</output>

<gadget id="calculator">199 * 51</gadget>
<output>10_149</output>

<gadget id="calculator">1.99 * 2_100</gadget>
<output>4_179</output>

<gadget id="calculator">5_572 + 10_149 + 4_179</gadget>
<output>19_900</output>

<result>19_900</result>