Answer: (4+3+2+ 1)×2
= 10×2
=20 (bar).
A: There are 20 line segments in the picture.
Analysis: First, there are four small line segments on the AB line, then three are combined, then two are combined, and finally there are 1, 4+3+2+ 1= 10. Similarly, there is 10 on the CD line segment, which adds up to one.
Knowledge expansion
Learning mathematics requires persistence and constant practice. The following are some methods and suggestions for learning mathematics:
Establish a solid foundation: Mathematics is a deepening subject, and it is very important to establish a solid foundation. First, make sure that you have mastered the basic four operations and basic mathematical concepts.
Reading math textbooks and reference books: choose a math textbook that suits your current level and study in the order of textbooks. If you encounter difficulties in understanding, you can refer to other math textbooks or reference books.
Pay attention to practice: Mathematics is a highly practical subject, and theoretical study is only the first step, which requires a lot of practice to consolidate and apply what you have learned. Doing a lot of exercises and problem sets and finding some challenging problems to solve are helpful to deepen the understanding of mathematical concepts and methods.
Help-seeking discussion: If you encounter difficulties or questions, ask for help in time. You can find teachers, classmates or online math forums to answer and discuss. Discussing problems with others can help you better understand and apply mathematics knowledge.
Use Internet resources: There are many math learning resources online, such as math teaching videos and online math courses. Using these resources can increase the learning methods and improve the learning effect.
Cultivate mathematical thinking: Mathematical thinking is the key to solving problems. Learning mathematics is not only to remember formulas and methods, but also to cultivate mathematical thinking modes and habits. Always think and discuss mathematical problems, and exercise your logical reasoning ability and problem-solving ability.
Most importantly, learning mathematics requires perseverance and patience, and don't give up easily. I believe that I can master mathematics, and hard work and dedication will definitely bring progress.