There is no picture, but there is a problem. The fifth grade edition of Beijing Normal University, the second volume of mathematics has 20 to 2 1 page pictures. Let's start with page 20. At the top of page 20 is the fifth question. What is the sum of the dough machines of a cube with five sides 10 cm? Disassemble it as shown below. Is it equal to the surface area of a cuboid? Communicate with peers. The sixth question is, how many material units do you need to make a drawer like the right with the same raw materials? I can only say so much!