1, cut with edges 4 cm high to make two 2 cm high cuboids with the largest sum of surface areas, namely

(8*6+8*2+6*2)*2*2=

2. A cylinder is a cylinder with a radius of 6 minutes and a height of 6 minutes, and its volume is

3. 14*6*6*6=

3. The length is increased by 2 decimeters, and the volume is increased by 40 cubic decimeters, which means that the width * height =40/2=20 square decimeters.

Similarly, length * height =90/3=30 cubic decimeters. This is not a height increase of 4 decimeters and a volume increase of 96 cubic decimeters. If yes, then length * width =96/4=24.

The surface area is (20+30+24)*2=

4. Let the side length be 1 and the body surface area of each strip be 6.

The surface area of a cuboid is (1*1+1*1+1* 2) * 2 = 8.

The surface area of a cuboid is 8/(6+6)=2/3 of the sum of the areas of two cubes.