A wire is 1 meter long, (1/5) meter is used for the first time, and (3/5) meter is used for the second time. How much rice is left?
一根铁丝长1米，第一次用去(1/5)米，第二次用去(3/5)米．还剩多少米？
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">1 - (1/5) - (3/5)</gadget>
<output>1/5 = around 0.2</output>

<result>1/5 = around 0.2</result>