For a section of road, the full length (1/2) was repaired on the first day, the remaining (1/2) was repaired on the second day, and the remaining (1/2) was repaired on the third day. How much is the remaining full length.
一段路，第一天修了全长的(1/2)，第二天修了剩下的(1/2)，第三天又修了剩下的(1/2)，还剩全长的多少．
<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">(1/2) * (1/2)</gadget>
<output>1/4 = around 0.25</output>

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

<gadget id="calculator">(1/4) * (1/2)</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">1 - (1/2) - (1/4) - (1/8)</gadget>
<output>1/8 = around 0.125</output>

<result>1/8 = around 0.125</result>