Calculation: (2/(1*2))+(2/(2*3))+(2/(3*4))+…+(2/(200*201)).
计算：(2/(1*2))+(2/(2*3))+(2/(3*4))+…+(2/(200*201))．
<gadget id="calculator">1 / 201</gadget>
<output>1/201 = around 0.004975</output>

<gadget id="calculator">1 - (1/201)</gadget>
<output>200/201 = around 0.995025</output>

<gadget id="calculator">2 * (200/201)</gadget>
<output>400/201 = around 1.99005</output>

<result>400/201 = around 1.99005</result>