(1998/(1*2))+(1998/(2*3))+(1998/(3*4))+(1998/(4*5))+(1998/(5*6)).
(1998/(1*2))+(1998/(2*3))+(1998/(3*4))+(1998/(4*5))+(1998/(5*6))．
<gadget id="calculator">1 * 2</gadget>
<output>2</output>

<gadget id="calculator">1_998 / 2</gadget>
<output>999</output>

<gadget id="calculator">2 * 3</gadget>
<output>6</output>

<gadget id="calculator">1_998 / 6</gadget>
<output>333</output>

<gadget id="calculator">3 * 4</gadget>
<output>12</output>

<gadget id="calculator">1_998 / 12</gadget>
<output>333/2 = around 166.5</output>

<gadget id="calculator">4 * 5</gadget>
<output>20</output>

<gadget id="calculator">1_998 / 20</gadget>
<output>999/10 = around 99.9</output>

<gadget id="calculator">5 * 6</gadget>
<output>30</output>

<gadget id="calculator">1_998 / 30</gadget>
<output>333/5 = around 66.6</output>

<gadget id="calculator">999 + 333 + (333/2) + (999/10) + (333/5)</gadget>
<output>1_665</output>

<result>1_665</result>