A batch of goods weighing 2 tons has been transported away (5/12), how much is left.
一批货物重2吨，运走了(5/12)，还剩多少．
<gadget id="calculator">5 / 12</gadget>
<output>5/12 = around 0.416667</output>

<gadget id="calculator">1 - (5/12)</gadget>
<output>7/12 = around 0.583333</output>

<result>7/12 = around 0.583333</result>