A 4-meter-long rope, after cutting off (3/4) of it, and then cutting off (3/4) meters, how many meters are left?
一根4米长的绳子，剪去它的(3/4)后，又剪去(3/4)米，还剩下多少米．
<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">4 * (3/4)</gadget>
<output>3</output>

<gadget id="calculator">4 - 3 - (3/4)</gadget>
<output>1/4 = around 0.25</output>

<result>1/4 = around 0.25</result>