Calculate ((1999*20002000)/(2000*19991999))=how much.
计算((1999*20002000)/(2000*19991999))=多少．
<gadget id="calculator">1_999 * 20_002_000</gadget>
<output>39_983_998_000</output>

<gadget id="calculator">2_000 * 19_991_999</gadget>
<output>39_983_998_000</output>

<gadget id="calculator">39_983_998_000 / 39_983_998_000</gadget>
<output>1</output>

<result>1</result>