A (4/5) meter long iron wire surrounds a square, what is the side length of the square in meters.
用一根(4/5)米长的铁丝围成一个正方形，正方形的边长是多少米．
<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">(4/5) / 4</gadget>
<output>1/5 = around 0.2</output>

<result>1/5 = around 0.2</result>