(1/2)+(1/6)+(1/12)+(1/20)+...+(1/56)=how much.
(1/2)+(1/6)+(1/12)+(1/20)+…+(1/56)=多少．
<gadget id="calculator">1 / 8</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">1 - (1/8)</gadget>
<output>7/8 = around 0.875</output>

<result>7/8 = around 0.875</result>