According to the meaning of the question, we can know that this is a special cuboid with a square top and bottom. It can be considered that its length is 4 decimeters, its width is 4 decimeters, and its height is 1.5 decimeters. Then, according to the surface area of the cuboid = (length× width+length× height+width× height) ×2, the data is substituted into the formula.

answer

Solution: (4× 4+4×1.5+4×1.5) × 2.

=( 16+6+6)×2

=28×2

=56 (square decimeter).

The surface area of this piece of wood is 56 square decimeters.

comment

The key to solve this problem is to define the length, width and height of a rectangular cube as 4 decimeters 1.5 decimeters, and then solve it according to the formula for calculating the surface area of a cuboid.