A triangle, the length of the first side is (5/12) meters, the second side is (2/21) meters longer than the first side, and the third side is (1/21) meters shorter than the first side, the triangle What is the circumference in meters?
一个三角形，第一条边的长度是(5/12)米，第二条比第一条长(2/21)米，第三条比第一条短(1/21)米，这个三角形的周长是多少米？
<gadget id="calculator">5 / 12</gadget>
<output>5/12 = around 0.416667</output>

<gadget id="calculator">2 / 21</gadget>
<output>2/21 = around 0.095238</output>

<gadget id="calculator">1 / 21</gadget>
<output>1/21 = around 0.047619</output>

<gadget id="calculator">(5/12) - (1/21)</gadget>
<output>31/84 = around 0.369048</output>

<gadget id="calculator">(5/12) + (5/12) + (2/21) + (31/84)</gadget>
<output>109/84 = around 1.297619</output>

<result>109/84 = around 1.297619</result>