Calculation: (1/(1*2*3))+(1/(2*3*4))+(1/(3*4*5))+…+(1/(7*8*9) ).
计算：(1/(1*2*3))+(1/(2*3*4))+(1/(3*4*5))+…+(1/(7*8*9))．
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">27 + 8</gadget>
<output>35</output>

<gadget id="calculator">35 / 72</gadget>
<output>35/72 = around 0.486111</output>

<gadget id="calculator">(1/2) * (35/72)</gadget>
<output>35/144 = around 0.243056</output>

<result>35/144 = around 0.243056</result>