The side length of a square is (2/5) meters, what is its area in square meters?
一个正方形的边长是(2/5)米，它的面积是多少平方米？
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">(2/5) * (2/5)</gadget>
<output>4/25 = around 0.16</output>

<result>4/25 = around 0.16</result>