Calculation: ((1996+1995*1997)/(1996*1997-1))+((1997+1996*1998)/(1997*1998-1))+((1998+1997*1999)/(1998* 1999-1)).
计算：((1996+1995*1997)/(1996*1997-1))+((1997+1996*1998)/(1997*1998-1))+((1998+1997*1999)/(1998*1999-1))．
<gadget id="calculator">1_995 * 1_997</gadget>
<output>3_984_015</output>

<gadget id="calculator">1_996 + 3_984_015</gadget>
<output>3_986_011</output>

<gadget id="calculator">1_996 * 1_997</gadget>
<output>3_986_012</output>

<gadget id="calculator">3_986_012 - 1</gadget>
<output>3_986_011</output>

<gadget id="calculator">3_986_011 / 3_986_011</gadget>
<output>1</output>

<gadget id="calculator">1_996 * 1_998</gadget>
<output>3_988_008</output>

<gadget id="calculator">1_997 + 3_988_008</gadget>
<output>3_990_005</output>

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

<gadget id="calculator">3_990_006 - 1</gadget>
<output>3_990_005</output>

<gadget id="calculator">3_990_005 / 3_990_005</gadget>
<output>1</output>

<gadget id="calculator">1_997 * 1_999</gadget>
<output>3_992_003</output>

<gadget id="calculator">1_998 + 3_992_003</gadget>
<output>3_994_001</output>

<gadget id="calculator">1_998 * 1_999</gadget>
<output>3_994_002</output>

<gadget id="calculator">3_994_002 - 1</gadget>
<output>3_994_001</output>

<gadget id="calculator">3_994_001 / 3_994_001</gadget>
<output>1</output>

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

<result>3</result>