(1/(1*2))+(1/(2*3))+(2/(3*5))+(3/(5*8))=how much.
(1/(1*2))+(1/(2*3))+(2/(3*5))+(3/(5*8))=多少．
<gadget id="calculator">1 * 2</gadget>
<output>2</output>

<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<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 * 5</gadget>
<output>15</output>

<gadget id="calculator">2 / 15</gadget>
<output>2/15 = around 0.133333</output>

<gadget id="calculator">5 * 8</gadget>
<output>40</output>

<gadget id="calculator">3 / 40</gadget>
<output>3/40 = around 0.075</output>

<gadget id="calculator">(1/2) + (1/6) + (2/15) + (3/40)</gadget>
<output>7/8 = around 0.875</output>

<result>7/8 = around 0.875</result>