Naughty used (2/5) of a piece of colored paper to make a paper flower, and used (1/5) of this colored paper to make a star, what fraction of this colored paper is left?
淘气用一张彩纸的(2/5)做了纸花，用这张彩纸的(1/5)做了星星，还剩下这张彩的几分之几？
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 - (2/5) - (1/5)</gadget>
<output>2/5 = around 0.4</output>

<result>2/5 = around 0.4</result>