There are 2 tons of coal in the school cafeteria, (1/2) is used in the first week, (1/2) is used in the second week, and the amount used in the second week is the amount of the first week.
学校食堂有2吨煤，第一周用去(1/2)，第二周用去(1/2)吨，第二周用去的是第一周的多少．
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">2 * (1/2)</gadget>
<output>1</output>

<gadget id="calculator">(1/2) / 1</gadget>
<output>1/2 = around 0.5</output>

<result>1/2 = around 0.5</result>