(1/3)+(1/15)+(1/35)+(1/63)+(1/99)+(1/143)=how much.
(1/3)+(1/15)+(1/35)+(1/63)+(1/99)+(1/143)=多少．
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1 / 15</gadget>
<output>1/15 = around 0.066667</output>

<gadget id="calculator">1 / 35</gadget>
<output>1/35 = around 0.028571</output>

<gadget id="calculator">1 / 63</gadget>
<output>1/63 = around 0.015873</output>

<gadget id="calculator">1 / 99</gadget>
<output>1/99 = around 0.010101</output>

<gadget id="calculator">1 / 143</gadget>
<output>1/143 = around 0.006993</output>

<gadget id="calculator">(1/3) + (1/15) + (1/35) + (1/63) + (1/99) + (1/143)</gadget>
<output>6/13 = around 0.461538</output>

<result>6/13 = around 0.461538</result>