After sawing off (4/5) of a steel pipe, what fraction is left? What percentage is the remaining steel pipe less than the sawed one?
一根钢管，锯下(4/5)后，还剩下几分之几？剩下的钢管比锯了的少几分之几？
<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">1 - (4/5)</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">(4/5) - (1/5)</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">(3/5) / (4/5)</gadget>
<output>3/4 = around 0.75</output>

<result>3/4 = around 0.75</result>