A rope is (4/5) meters long, if (3/4) of the full length is cut off, what remains of the full length.
一根绳子长(4/5)米，剪去全长的(3/4)，还剩下全长的多少．
<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

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

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