Simple calculation: 1999+1999*1999.
简便运算：1999+1999*1999．
<gadget id="calculator">1_999 * 1_999</gadget>
<output>3_996_001</output>

<gadget id="calculator">1_999 + 3_996_001</gadget>
<output>3_998_000</output>

<result>3_998_000</result>