Calculate with a simple method. ((1999+19991999+199919991999)/(2005+20052005+200520052005)).
用简便方法计算．((1999+19991999+199919991999)/(2005+20052005+200520052005))．
<gadget id="calculator">1_999 + 19_991_999 + 199_919_991_999</gadget>
<output>199_939_985_997</output>

<gadget id="calculator">2_005 + 20_052_005 + 200_520_052_005</gadget>
<output>200_540_106_015</output>

<gadget id="calculator">199_939_985_997 / 200_540_106_015</gadget>
<output>1_999/2_005 = around 0.997007</output>

<result>1_999/2_005 = around 0.997007</result>