(1/2)+(1/4)+(1/8)+(1/16)+(1/32)+(1/64)+(1/128).
(1/2)+(1/4)+(1/8)+(1/16)+(1/32)+(1/64)+(1/128)．
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 / 8</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">1 / 16</gadget>
<output>1/16 = around 0.0625</output>

<gadget id="calculator">1 / 32</gadget>
<output>1/32 = around 0.03125</output>

<gadget id="calculator">1 / 64</gadget>
<output>1/64 = around 0.015625</output>

<gadget id="calculator">1 / 128</gadget>
<output>1/128 = around 0.007812</output>

<gadget id="calculator">(1/2) + (1/4) + (1/8) + (1/16) + (1/32) + (1/64) + (1/128)</gadget>
<output>127/128 = around 0.992188</output>

<result>127/128 = around 0.992188</result>