1) There are too many packing methods. Imagine Tetris. There are five kinds of flat and five kinds of straight. Three pieces lie flat, and the other piece lies flat and stacked, that is, four kinds; Then there are three vertical pieces, then four stacked pieces, and then there are countless ways to put them horizontally and vertically. (There may be bugs in the topic itself, so it is not required to be considered. )
The most economical way, of course, is to stuff (2 1) inside as much as possible, that is, put four pieces of paper straight and spell it into the shape of Tian Zi, so that a * * * will use up 24 areas of paper.
2) The same thinking must be straightforward.
Then pay attention to the perimeter theorem (for example): dig out any small square of the word "Tian" and the perimeter remains unchanged.
So we try to construct a more regular packaging method.
At least this is the case:
mouth
Buckle buckle
Buckle buckle
Perimeter 12, minimum. Others, whether 2x4, 1x8 or 3x4, have large perimeters, so they have large surface areas.
I hope it helps you.