The topic analysis is as follows:
1. Bake five cakes: bake two cakes at the same time, and both sides need 3×2=6 minutes. The last three imprints, the first and second in front for 3 minutes, the first behind and the third in front for 3 minutes, the second behind and the third behind for 3×3=9 minutes, the third * * *, the fifth * * *, 6+9= 15 minutes.
2. Bake 10 cakes, and bake two cakes at the same time each time, each time it takes 3×2=6 minutes, and * * * takes (10÷2)×6=30 minutes. Bake two at the same time, and it takes 3×2=6 minutes before and after. At the same time, it takes 3×3=9 minutes to brand 3 * * and 6+9= 15 minutes to brand 5 * *; Bake two pieces at a time, 10 * * to: (10÷2)×(2×3)=5×6=30 minutes.
Comments: This title is the original question in the final examination paper of mathematics in the first volume of the fourth grade. The main purpose of solving this problem is to understand the relationship between the number of cakes and the required time in the pancake problem that two cakes can be baked at most in one pot at the same time: required time = quantity × time spent baking one side. Knowing this, you can solve the answer quickly.
Methods of learning mathematics well
1. Mathematics is a progressive subject, which needs to understand and master basic concepts, principles and formulas. By reading textbooks, attending lectures and remedial classes, we can lay a good foundation and master basic knowledge. In the process of learning, we should keep the logical thinking clear and record the key contents to facilitate review and consolidation. You can practice with examples and exercises to deepen your understanding of knowledge points.
2. Mathematics needs repeated training to improve skills and application ability. Complete a lot of exercises, including after-school exercises, simulation questions, etc. , cultivate the ability to solve problems and use mathematical knowledge flexibly. In the process of learning, if you encounter difficulties or problems that you don't understand, ask teachers, classmates or parents in time. Participate in study groups or related forums, share learning experiences with others and promote each other.