1. Multiple choice questions: 5 points for each question, * * 25 points.
1. Among the following quantities, the quantity with opposite meaning is ()
A, income 200 yuan, profit 200 yuan b, up10m, down 7m.
C, "black" and "white" D, "You are 3cm taller than me" and "I am 3kg heavier than you"
2. In order to welcome the upcoming Guangzhou Asian Games, the Asian Games Organizing Committee invested RMB 2,654,38+098,000,000 yuan to build various sports facilities, expressed by scientific notation.
A yuan b yuan c yuan d yuan
3. In the following calculation, the error is ().
A, B, C, D,
4. For the approximate number 0. 1830, the following statement is true ()
A, there are two significant figures, accurate to one thousandth of b, there are three significant figures, accurate to one thousandth.
C, there are four significant figures, accurate to ten thousand d, there are five significant figures, accurate to ten thousand.
5. The following statement is true ()
A. it must be negative. B must be a negative number. C cannot be a negative number. D must be a negative number.
Two. Fill in the blanks: (5 points for each question, ***25 points)
6. If it is 0
7. If yes, 2a
8. As shown in the figure, the real numbers corresponding to each point on the number axis are,
Then the distance between them is. (expressed by inclusion)
9. If x2=4 and y2 =9, then x+y=
10, and positive integers are arranged according to the following rules. Please write the numbers in the sixth and fifth columns.
Three. Problem solving: 6 points for each question, * * 24 points.
1 1.① (-5)×6+(- 125) ÷(-5) ② 3 12 +(- 12 )-(- 13 )+223
③(23 - 14 -38 +524 )×48 ④- 18÷ (-3)2+5×(- 12 )3-(- 15) ÷5
Fourth, answer questions:
12. (6 points in this small question) Fill in the following figures in the corresponding sets respectively.
(1) A set of positive numbers: {…};
(2) set of negative numbers: {…};
(3) Integer set: {…};
(4) Music score setting: {…}
13. (6 points in this small question) The meteorological observation data of a sounding balloon in a certain place show that the temperature will drop by about 6℃ every time the height increases 1 km. If the ground temperature is 2 1℃ and the temperature somewhere in the sky is -39℃, what is the height here?
14. It is known that there are several axes on the paper (as shown in the figure), and the paper is folded.
(1) If the point indicated by 1 coincides with the point indicated by-1, then the point indicated by -2 coincides with the point indicated by numbers;
(2) If the point indicated by-1 coincides with the point indicated by 3, then
The point indicated by 5 coincides with the point indicated by numbers;
15. (8 points in this small question) The final scores of 10 students in a class are randomly selected, based on 80, and the excess part is recorded as positive, and the insufficient part is recorded as negative. The recorded results are as follows: +8, -3,+12, -7,-10, -3.
(1) What are the grades of the students in this 10? What's the lowest score?
(2) What percentage of students in10 are below 80?
(3) 10 What is the average score of students?
The seventh grade mathematics unit 1 examination paper
Reference answer
1.B 2。 C 3。 D 4。 C 5。 C
6.7.≤ 8.n-m 9。 1 10.32
1 1①-5 ②6 ③ 12 ④
12① ②
③ ④
13.10km
14.①2 ②-3
15.① score: 92; The lowest score is 70 points.
② There are 5 people below 80 points. The percentage is 50%.
10 The average score of students is 80 points.