A 3-meter-long rope, first cut off (1/2), and then cut off (1/2) meter, then how many meters are left.
一根3米长的绳子，先剪下它的(1/2)，再剪下(1/2)米，这时还剩下多少米．
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">3 * (1/2)</gadget>
<output>3/2 = around 1.5</output>

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

<result>1</result>