Required Mathematical Intelligence

Chapter 44 Two Creases
Tried to fold a long, thin piece of paper in half, but failed twice.The first time it was 1 cm longer than the other half, and the second time it was just the opposite, this half was 1 cm shorter.How wide is the gap between the two creases?
[Answer: It is very simple to draw a conclusion by doing it yourself. The distance between the two creases is 1 cm. It is easy to find the answer from the common matchbox in daily life.However, starting from the flexibility of training thinking, we can give up the experiment and use abstract reasoning. For example, if the total length of the paper is y, the short side is X and the length is x 1, then y=2x 1, we can judge the difference between the two folds. The distance is equal to the difference between the long and short sides. ]
(End of this chapter)