Calculation: (1/(2*4))+(1/(4*6))+(1/(6*8))+(1/(8*10))=how much.
计算：(1/(2*4))+(1/(4*6))+(1/(6*8))+(1/(8*10))=多少．
<gadget id="calculator">2 * 4</gadget>
<output>8</output>

<gadget id="calculator">1 / 8</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">4 * 6</gadget>
<output>24</output>

<gadget id="calculator">1 / 24</gadget>
<output>1/24 = around 0.041667</output>

<gadget id="calculator">6 * 8</gadget>
<output>48</output>

<gadget id="calculator">1 / 48</gadget>
<output>1/48 = around 0.020833</output>

<gadget id="calculator">8 * 10</gadget>
<output>80</output>

<gadget id="calculator">1 / 80</gadget>
<output>1/80 = around 0.0125</output>

<gadget id="calculator">(1/8) + (1/24) + (1/48) + (1/80)</gadget>
<output>1/5 = around 0.2</output>

<result>1/5 = around 0.2</result>