Test paper sharing 04
The knowledge points examined in 1-8 are: scientific notation, definition of square root, calculation of algebraic addition and subtraction, comprehensive application of reciprocal, reciprocal and absolute value, and application of combination of numbers and shapes in number axis. The above questions are all basic questions, and students can only get high marks if they get full marks.
The knowledge points involved in the 9- 12 question are: the calculation of rational number, the application of the solution of the linear equation with one variable, the application of the solution method and the application of the power. Many students made mistakes in 1 1. In fact, this question examines the periodic law. Please count a few more numbers, find several number cycles, and you can get the result.
13 questions examine two points to determine a straight line, and 14 questions examine the nonnegativity of the absolute value of the sum of squares. I believe the teacher has talked about this problem many times in class. 15 examines the overall thinking, 16 examines the application of linear equations with one variable, in which examination and analysis are the key points, and 17 examines the classified thinking in line segments.
18 is the last question in the fill-in-the-blank question, and many students can't. This topic is discussed in different situations.
The first case is that the water in container B is not injected into container A. The available B water level should be 1.5cm, so the available time is 1.5÷(5/6)= 1.8 minutes.
In the second case, the water in container B is injected into A, and the strain of water in A is 4.5cm, and the water newly injected into A should be 3.5cm. Then, first, calculate that when the water in B and C just reaches 5cm, the time it takes is 5÷(5/6)=6 minutes, and then B and C simultaneously inject 3.5cm into A, so that 3.5 \ can be obtained.
Question type 19-2 1 examines calculation problems, among which the common questions are: mixed operation of rational numbers, solving linear equations with one variable, addition and subtraction of algebraic expressions. Question 22 is to find a regular question, which is not very difficult. Please answer carefully.
Question 23 examines the calculation in the angle, and question 24 examines the application of linear equations. Please examine the questions carefully and find out the equivalence in the questions.
Question 25 is the last question in the solution. Many students don't ask questions (2) and (3). The reason why they can't ask questions (2) and (3) is that they haven't learned how to meet and pursue. Problem (2) is the problem of meeting. Find the velocities of points P and Q first, and then find the number represented by point D. The answer to this question is 15. Problem (3) is the pursuit problem. From the meaning of the question, we can get 1.5t+ 180=4.5t and t=60.