A 5-meter-long rope is cut off (2/5) for the first time and (1/10) for the second time. What fraction of the total length is the remaining rope?
一根5米长的绳子，第一次剪去(2/5)，第二次剪去(1/10)，剩下的绳子是全长的几分之几？
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 / 10</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">1 - (2/5) - (1/10)</gadget>
<output>1/2 = around 0.5</output>

<result>1/2 = around 0.5</result>