A piece of square paper, its perimeter is (4/9) decimeters, fold it in half into a rectangle, what is the perimeter of the rectangle in decimeters.
一张正方形纸，它的周长是(4/9)分米，把它对折成长方形，长方形的周长是多少分米．
<gadget id="calculator">4 / 9</gadget>
<output>4/9 = around 0.444444</output>

<gadget id="calculator">(4/9) / 4</gadget>
<output>1/9 = around 0.111111</output>

<gadget id="calculator">(1/9) * 3</gadget>
<output>1/3 = around 0.333333</output>

<result>1/3 = around 0.333333</result>