The perimeter of a triangle is 1 meter, and the length of two sides is (2/5) meters, how many decimeters is the length of the other side? What kind of triangle is this?
一个三角形的周长是1米，其中有两条边的长度都是(2/5)米，还有一条边的长度是多少分米？这是一个什么样的三角形？
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">(2/5) * 2</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">(1/5) * 10</gadget>
<output>2</output>

<result>2</result>