(1/3)+(1/15)+(1/35)+(1/63)+(1/99)+(1/143)+(1/195)+(1/255)=how much.
(1/3)+(1/15)+(1/35)+(1/63)+(1/99)+(1/143)+(1/195)+(1/255)=多少．
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1 - (1/3)</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">(1/3) - (1/5)</gadget>
<output>2/15 = around 0.133333</output>

<gadget id="calculator">1 / 7</gadget>
<output>1/7 = around 0.142857</output>

<gadget id="calculator">(1/5) - (1/7)</gadget>
<output>2/35 = around 0.057143</output>

<gadget id="calculator">1 / 9</gadget>
<output>1/9 = around 0.111111</output>

<gadget id="calculator">(1/7) - (1/9)</gadget>
<output>2/63 = around 0.031746</output>

<gadget id="calculator">1 / 11</gadget>
<output>1/11 = around 0.090909</output>

<gadget id="calculator">(1/9) - (1/11)</gadget>
<output>2/99 = around 0.020202</output>

<gadget id="calculator">1 / 13</gadget>
<output>1/13 = around 0.076923</output>

<gadget id="calculator">(1/11) - (1/13)</gadget>
<output>2/143 = around 0.013986</output>

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

<gadget id="calculator">(1/13) - (1/15)</gadget>
<output>2/195 = around 0.010256</output>

<gadget id="calculator">(1/15) - (1/15)</gadget>
<output>0</output>

<gadget id="calculator">(2/3) + (2/15) + (2/35) + (2/63) + (2/99) + (2/143) + (2/195) + 0</gadget>
<output>14/15 = around 0.933333</output>

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

<gadget id="calculator">(14/15) * (1/2)</gadget>
<output>7/15 = around 0.466667</output>

<result>7/15 = around 0.466667</result>