There are 7 bamboo poles arranged in a row. The first bamboo pole is 1 meter long, and each other is half the length of the previous one. Question: What is the total length of the 7 bamboo poles in meters?
有7根竹竿排成一行．第一根竹竿长1米，其余每根长都是前一根的一半．问：这7根竹竿的总长是多少米．
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

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

<gadget id="calculator">1 * (1/2) * 1 * (1/2)</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 * (1/2) * 1 * (1/2) * 1 * (1/2)</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">1 * (1/2) * 1 * (1/2) * 1 * (1/2) * 1 * (1/2)</gadget>
<output>1/16 = around 0.0625</output>

<gadget id="calculator">1 * (1/2) * 1 * (1/2) * 1 * (1/2) * 1 * (1/2) * 1 * (1/2)</gadget>
<output>1/32 = around 0.03125</output>

<gadget id="calculator">1 * (1/2) * 1 * (1/2) * 1 * (1/2) * 1 * (1/2) * 1 * (1/2) * 1 * (1/2)</gadget>
<output>1/64 = around 0.015625</output>

<gadget id="calculator">1 + (1/2) + (1/4) + (1/8) + (1/16) + (1/32) + (1/64)</gadget>
<output>127/64 = around 1.984375</output>

<result>127/64 = around 1.984375</result>