The lengths of the three sides of a triangle are (1/5) meter, (3/10) meter and (1/2) meter respectively. What is the perimeter of the triangle in meters?
一个三角形三条边的长度分别是(1/5)米，(3/10)米和(1/2)米，这个三角形的周长是多少米？
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">3 / 10</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">(1/5) + (3/10) + (1/2)</gadget>
<output>1</output>

<result>1</result>