A bag of cement, use up (2/8) for the first time, and (3/8) for the second time. How much of this bag of cement is left?
一袋水泥，第一次用去(2/8)，第二次用去(3/8)．这袋水泥还剩下几分之几？
<gadget id="calculator">2 / 8</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>