The perimeter of an equilateral triangle is (3/7) decimeters, what is the length of each side of it?
一个等边三角形周长是(3/7)分米，它的每条边长是多少分米．
<gadget id="calculator">3 / 7</gadget>
<output>3/7 = around 0.428571</output>

<gadget id="calculator">(3/7) / 3</gadget>
<output>1/7 = around 0.142857</output>

<result>1/7 = around 0.142857</result>