1-(1/2)-(1/4)-(1/8)-(1/16)-(1/32)-(1/64)-(1/128).
1-(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 - (1/2) - (1/4) - (1/8) - (1/16) - (1/32) - (1/64) - (1/128)</gadget>
<output>1/128 = around 0.007812</output>

<result>1/128 = around 0.007812</result>