The seventh grade mathematical rational number unit test questions (with answers)
Choose one carefully first (5 points for each question, * * * 30 points).
1. The following statement is true ()
A. there is the smallest positive number B. Have the smallest natural number
C. there is the largest rational number D. There is no maximum negative integer.
2. The following statement is true ()
A. The number whose reciprocal equals itself is only 1 b. The number whose square equals itself is only1.
C. A cube is only equal to its own number 1 d, and the absolute value of a positive number is itself.
3. As shown in the figure, then the following conclusion is correct' Yes ().
A is bigger than b, and b is bigger than a.
C.A. is as big as B. The sizes of D.A. and B are uncertain.
4. When two rational numbers are divided and their quotient is negative, then these two rational numbers ().
A. all negative numbers B. all positive numbers C. one positive number D. one zero.
Yuan Longping, the father of hybrid rice in China, presided over the research of a super hybrid rice with an average yield of 820kg per mu. A certain place plans to plant 3 000 mu of this super hybrid rice this year. It is estimated that the total yield of this super hybrid rice harvested in this place this year (expressed by scientific notation) is ().
A.2.5 106 kg
C.2.46 106 kg D.2.4438+005 kg
6. If ︱2a︱=-2a, then A must be ().
A. positive number B. negative number C. positive number or zero D. negative number or zero
Two, fill in a carefully (2 points per space, ***30 points)
7. The reciprocal of-23 is; The reciprocal is; The absolute value is.
8. Calculation:1997248 (-6) =;
- 12 (- 13 ) = ; - 1.25(- 14 ) = .
9. Calculation: (-2) 3 =; (- 1) 10= ; - 32= .
10. At about 6.48, accurate to the right, there are significant figures.
1 1. There are integers with absolute values greater than 1 less than 4; On a certain day in winter, the lowest temperature in Shanghai is 3 degrees Celsius and the lowest temperature in Beijing is -5 degrees Celsius. On this day, the lowest temperature in Shanghai is oC higher than that in Beijing.
12. If x0, y0 and x2=4 and y2 =9, then x+y=
Three, calculate the following questions (6 points for each small question, ***24 points)
13.(-5)6+(- 125) (-5) 14.3 12 +(- 12 )-(- 13 )+223
15.(23 - 14 -38 +524 )48 16.- 18(-3)2+5(- 12 )3-(- 15) 5
Four. Application questions (8 points for each question, *** 16 points)
17. The final grade of a class randomly selected 10 students is based on 80, and the excess is positive and the deficiency is negative. The recorded results are as follows: +8, -3,+12, -7,-10, -3, -8,.
(1) 10 What is the highest score among the students? What's the lowest score?
(2) What percentage of students in10 are below 80?
(3) 10 What is the average score of students?
18. A patient needs to measure his blood pressure every afternoon. The table below shows the changes of systolic blood pressure from Monday to Friday. The patient's systolic blood pressure last Sunday was 160 unit.
Monday, Tuesday, Wednesday, Thursday and Friday.
Systolic blood pressure change (compared with the previous day) +30 -20+17+18 -20
Q: (1) When is the highest blood pressure this week? Which day is the lowest?
(2) Compared with last Sunday, did the patient's blood pressure increase or decrease on Friday?
The seventh grade last semester mathematics first chapter examination questions.
I. 1. B 2。 D 3。 B 4。 C 5。 C 6。 D
Second, seven. 23; -32 ; 23 .8.0; -8 ; 16 ; 5.
9.-8 ; 1 ; -9.10.percentage point, 3.11.4; 8 12. 1
Three. 13.5 14.6 15. 1 16.38
4. 17.( 1) The highest score is 80+ 12=92 (minutes), and the lowest score is 80- 10=70 (minutes) (2) 510/kloc.
(3) [8010+(8-3+12-7-10-3-8+10)]10 = 80.
18.( 1) The highest on Monday and the lowest on Tuesday and Friday. (2) On Friday, the blood pressure was 160-20= 140, which decreased.
The seventh grade mathematics autonomous learning test (I)
Fill in the blanks
1.2.3. or 1 4.
5.9 6.7.8.55% ,33
9. 10. 1 0, nonnegative 1 1.
12.2 13.5 14. 15. 16.4
Second, answer the question.
17.( 1) ; (2)20; (3) ; (4)65 18. Return to the original position; (2) 12; (3)54
19.( 1), and the verification is omitted; (2) 。