2009*1991．
2009*1991．
<gadget id="calculator">10 * 1_991</gadget>
<output>19_910</output>

<gadget id="calculator">19_910 - 1_991</gadget>
<output>17_919</output>

<gadget id="calculator">3_982_000 + 17_919</gadget>
<output>3_999_919</output>

<result>3_999_919</result>