Calculation: ((1/2015)*(1/2016)+(1/2016)*(1/2017))*2015*2017.
计算：((1/2015)*(1/2016)+(1/2016)*(1/2017))*2015*2017．
<gadget id="calculator">1 / 2_015</gadget>
<output>1/2_015 = around 0.000496</output>

<gadget id="calculator">1 / 2_016</gadget>
<output>1/2_016 = around 0.000496</output>

<gadget id="calculator">(1/2_015) * (1/2_016)</gadget>
<output>1/4_062_240 = around 0</output>

<gadget id="calculator">1 / 2_017</gadget>
<output>1/2_017 = around 0.000496</output>

<gadget id="calculator">(1/2_016) * (1/2_017)</gadget>
<output>1/4_066_272 = around 0</output>

<gadget id="calculator">(1/4_062_240) + (1/4_066_272)</gadget>
<output>2/4_064_255 = around 0</output>

<gadget id="calculator">(2/4_064_255) * 2_015 * 2_017</gadget>
<output>2</output>

<result>2</result>