(11/12) minus how much difference is (1/4).
(11/12)减去多少的差是(1/4)．
<gadget id="calculator">11 / 12</gadget>
<output>11/12 = around 0.916667</output>

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">(11/12) - (1/4)</gadget>
<output>2/3 = around 0.666667</output>

<result>2/3 = around 0.666667</result>