Calculation: (1/1998)+(2/1998)+(3/1998)+(4/1998)+...+(1996/1998)+(1997/1998).
计算：(1/1998)+(2/1998)+(3/1998)+(4/1998)+…+(1996/1998)+(1997/1998)．
<gadget id="calculator">1 + 1_997</gadget>
<output>1_998</output>

<gadget id="calculator">1_998 * 1_997</gadget>
<output>3_990_006</output>

<gadget id="calculator">1_998 * 2</gadget>
<output>3_996</output>

<gadget id="calculator">3_990_006 / 3_996</gadget>
<output>1_997/2 = around 998.5</output>

<result>1_997/2 = around 998.5</result>