Calculation: (503/(2012*2013))+(503/(2013*2014)).
计算：(503/(2012*2013))+(503/(2013*2014))．
<gadget id="calculator">2_012 * 2_013</gadget>
<output>4_050_156</output>

<gadget id="calculator">503 / 4_050_156</gadget>
<output>1/8_052 = around 0.000124</output>

<gadget id="calculator">2_013 * 2_014</gadget>
<output>4_054_182</output>

<gadget id="calculator">503 / 4_054_182</gadget>
<output>503/4_054_182 = around 0.000124</output>

<gadget id="calculator">(1/8_052) + (503/4_054_182)</gadget>
<output>1/4_028 = around 0.000248</output>

<result>1/4_028 = around 0.000248</result>