5-meter-long rope, cut off (2/5) for the first time, and (1/10) for the second time, how many meters 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)，剩下的绳子是多少米？
<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>

<gadget id="calculator">5 * (1/2)</gadget>
<output>5/2 = around 2.5</output>

<result>5/2 = around 2.5</result>