A pencil is (3/4) dm long, and (2/3) dm is used up, how much dm is left.
一枝铅笔长(3/4)dm，用去了(2/3)dm，还剩多少dm．
<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">(3/4) - (2/3)</gadget>
<output>1/12 = around 0.083333</output>

<result>1/12 = around 0.083333</result>