Calculation: (3/(1*4))+(3/(4*7))+(3/(7*10))+…+(3/(40*43)).
计算：(3/(1*4))+(3/(4*7))+(3/(7*10))+…+(3/(40*43))．
<gadget id="calculator">1 / 43</gadget>
<output>1/43 = around 0.023256</output>

<gadget id="calculator">1 - (1/43)</gadget>
<output>42/43 = around 0.976744</output>

<result>42/43 = around 0.976744</result>