(1/(2*3))+(1/(3*4))+(1/(4*5))+(1/(5*6))+(1/(6*7))= How many.
(1/(2*3))+(1/(3*4))+(1/(4*5))+(1/(5*6))+(1/(6*7))=多少．
<gadget id="calculator">2 * 3</gadget>
<output>6</output>

<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">3 * 4</gadget>
<output>12</output>

<gadget id="calculator">1 / 12</gadget>
<output>1/12 = around 0.083333</output>

<gadget id="calculator">4 * 5</gadget>
<output>20</output>

<gadget id="calculator">1 / 20</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">5 * 6</gadget>
<output>30</output>

<gadget id="calculator">1 / 30</gadget>
<output>1/30 = around 0.033333</output>

<gadget id="calculator">6 * 7</gadget>
<output>42</output>

<gadget id="calculator">1 / 42</gadget>
<output>1/42 = around 0.02381</output>

<gadget id="calculator">(1/6) + (1/12) + (1/20) + (1/30) + (1/42)</gadget>
<output>5/14 = around 0.357143</output>

<result>5/14 = around 0.357143</result>