One side of an isosceles triangle is (5/6) decimeter long and the base is (2/5) decimeter long. What is the perimeter of this triangle?
一个等腰三角形一条腰长(5/6)分米，底长(2/5)分米．这个三角形的周长是多少分米？
<gadget id="calculator">5 / 6</gadget>
<output>5/6 = around 0.833333</output>

<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">(5/6) + (5/6) + (2/5)</gadget>
<output>31/15 = around 2.066667</output>

<result>31/15 = around 2.066667</result>