A road was repaired on the first day (1/8), and on the second day (3/8), how much is left?
一条路，第一天修了(1/8)，第二天修了(3/8)，还剩下多少．
<gadget id="calculator">1 / 8</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">3 / 8</gadget>
<output>3/8 = around 0.375</output>

<gadget id="calculator">1 - (1/8) - (3/8)</gadget>
<output>1/2 = around 0.5</output>

<result>1/2 = around 0.5</result>