To build a canal (9/4) kilometers long, the full length (1/4) was repaired on the first day, and the full length (3/8) was repaired on the second day, leaving a fraction of the full length Didn't fix it?
修一条长(9/4)千米的水渠，第一天修好了全长的(1/4)，第二天修好了全长的(3/8)，还剩全长的几分之几没有修？
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

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

<gadget id="calculator">1 - (1/4) - (3/8)</gadget>
<output>3/8 = around 0.375</output>

<result>3/8 = around 0.375</result>