The length of the rectangle is (4/5) decimeters, and the width is (5/6), what is the area of the rectangle in square decimeters.
长方形的长是(4/5)分米，宽是长的(5/6)，长方形的面积是多少平方分米．
<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">5 / 6</gadget>
<output>5/6 = around 0.833333</output>

<gadget id="calculator">(4/5) * (5/6) * (4/5)</gadget>
<output>8/15 = around 0.533333</output>

<result>8/15 = around 0.533333</result>