A 6-meter-long rope, first cut off (1/2), and then cut off (1/2) meter, how many meters are left at this time
一根6米长的绳子，先截下(1/2)，再截下(1/2)米，这时还剩多少米
<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">6 * (1/2)</gadget>
<output>3</output>

<gadget id="calculator">3 - (1/2)</gadget>
<output>5/2 = around 2.5</output>

<result>5/2 = around 2.5</result>