Calculation: (1/(1*5))+(1/(5*10))+(1/(10*15))+(1/(15*20))+(1/(20*25) ) = how much.
计算：(1/(1*5))+(1/(5*10))+(1/(10*15))+(1/(15*20))+(1/(20*25))=多少．
<gadget id="calculator">1 * 5</gadget>
<output>5</output>

<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">5 * 10</gadget>
<output>50</output>

<gadget id="calculator">1 / 50</gadget>
<output>1/50 = around 0.02</output>

<gadget id="calculator">10 * 15</gadget>
<output>150</output>

<gadget id="calculator">1 / 150</gadget>
<output>1/150 = around 0.006667</output>

<gadget id="calculator">15 * 20</gadget>
<output>300</output>

<gadget id="calculator">1 / 300</gadget>
<output>1/300 = around 0.003333</output>

<gadget id="calculator">20 * 25</gadget>
<output>500</output>

<gadget id="calculator">1 / 500</gadget>
<output>1/500 = around 0.002</output>

<gadget id="calculator">(1/5) + (1/50) + (1/150) + (1/300) + (1/500)</gadget>
<output>29/125 = around 0.232</output>

<result>29/125 = around 0.232</result>