For a steel pipe of 5 meters, first cut off (1/2), and then cut off (1/2) meters, how many meters are left.
5米的钢管，先截去(1/2)，再截去(1/2)米，还剩多少米．
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

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

<gadget id="calculator">5 * (1/2)</gadget>
<output>5/2 = around 2.5</output>

<gadget id="calculator">(5/2) - (1/2)</gadget>
<output>2</output>

<result>2</result>