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How to do the ninth and 10 questions on page 14 of the sixth grade mathematics book published by Beijing normal university press?
Question 9: 4x75%x5+4= 19. The question 10 is still unclear.

Thinking is the core of mathematics learning method. Thinking is of great significance in learning this course. When solving math problems, we should first observe, analyze and think. Thinking can often find out the characteristics of the topic and find the breakthrough and simple method to solve the problem. Around us, students who really study well have the habit of thinking and thinking hard, so the more they use their brains, the smarter they become, and the more they think hard, the better they become.

Science study focuses on weekdays and is not suitable for surprise review. The most important thing to study on weekdays is to attend class for 45 minutes. Listen attentively and keep your thoughts close to the teacher. At the same time, it should be pointed out that many students tend to ignore the mathematical thinking methods taught by teachers and pay attention to the solution of problems. In fact, thinking methods such as "transformation" and "combination of numbers and shapes" are far more important than the solution of a problem.