Calculation: (1/(1*2*3*4))+(1/(2*3*4*5))+(1/(3*4*5*6))+…+(1/( 6*7*8*9))+(1/(7*8*9*10)).
计算：(1/(1*2*3*4))+(1/(2*3*4*5))+(1/(3*4*5*6))+…+(1/(6*7*8*9))+(1/(7*8*9*10))．
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

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

<gadget id="calculator">1 / 720</gadget>
<output>1/720 = around 0.001389</output>

<gadget id="calculator">(1/6) - (1/720)</gadget>
<output>119/720 = around 0.165278</output>

<gadget id="calculator">(1/2) * (119/720)</gadget>
<output>119/1_440 = around 0.082639</output>

<result>119/1_440 = around 0.082639</result>