A rectangular wooden frame with a length of 0.8 decimeters and a width of 0.6 decimeters is drawn into a parallelogram with a constant base and a height of 0.4 decimeters. The area is how many square decimeters less than the area of the rectangle.
一个长方形的木框，长0.8分米，宽0.6分米，把它拉成一个平行四边形，底不变，高是0.4分米，面积比长方形的面积少多少平方分米．
<result>0.12</result>