1. If +0.02g indicates that the quality of a ping-pong ball exceeds the standard quality by 0.02g, then the quality of a ping-pong ball is lower than the standard quality by 0.02g, which is recorded as ().
A.-0.02 Class B+0.02g Class C+0.04g Class D.
2. (adapted from Ningbo senior high school entrance examination) Among the following figures, the one that is neither positive nor negative is ().
A.0B.- 1C. 12D.2
3. (Suining Senior High School Entrance Examination) Among the following figures, the smallest figure is ()
A.0B.- 1C.32D.-2
The reciprocal of 4. -8 is ()
A.-6B.8C.- 16D. 18
About 40,050 is obtained by rounding. There are several statements about this figure, and the correct one is ().
A. accurate to tens of thousands of digits. B. accurate to 0.001c. accurate to ten thousand digits. D. accurate to ten digits.
6. (Zunyi Senior High School Entrance Examination) The result of calculating -3+(-5) is ()
A.2B。 -8C.8D.2
7. (Yancheng Senior High School Entrance Examination) In May 20 14, China and Russia signed a gas supply purchase and sale contract. Starting from 20 18, Russian gas supply to China eventually reached 38 billion cubic meters per year. This data is expressed in scientific notation as ().
a . 3.8× 109 b . 3.8× 10 10c . 3.8× 10 100d . 3.8× 10 12
8. (Hebei Senior High School Entrance Examination) Calculation: 3-2× (- 1) = ()
A.5B. 1C。 - 1D.6
9. The following calculation is correct ()
A.(- 14)-(+5)=-9b . 0-(-3)= 0+(-3)
C.(-3)×(-3)=-6D。 |3-5|=5-3
10. The profit and loss of a small shop in a school in one week is shown in the following table (daily fixed cost 200 yuan, where "+"means profit and "-"means loss).
Monday, 2345
Profit and loss +220-30+2 15-25+225
So this week * * * is profitable ()
A.7 15 yuan B. 630 yuan C.635 yuan D.605 yuan.
1 1. Multiply any two of the following four rational numbers 12, 0, 1 and -2, and the minimum product is ().
A. 12B.0C.- 1D。 -2
12. In a certain period of time, the computer works according to the program shown in the figure. If the input number is 2, the output number is ().
A.-54
b54
C.-558
D.558
13. As shown in the figure, four rational numbers respectively correspond to points M, P, N and Q on the number axis. If the rational number represented by point P and point N is reciprocal, then the point representing the absolute number in the graph is ().
A. point MB Point NC Police station. Point q
14. If (a+3) 2+| b-2 | = 0, the value of ab is ().
a . 6b-6c . 9d-9
15. Observe the following formula: 2 1 = 2, 22 = 4, 23 = 8, 24 = 16, 25 = 32, 26 = 64 ... Through observation, determine 2201with the rules you found.
A.2B.4C.6D.8
2. Fill in the blanks (5 small questions in this big question, 5 points for each small question, 25 points for * * *)
The absolute value of the reciprocal of 16. -32 is _ _ _ _ _.
17. The internal diameter of a part on the drawing is 30 0.05 (unit: mm), which means that the standard size of the part is 30mm, and the machining requirement is not greater than _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _.
18. There are _ _ _ _ _ * integers greater than-1.5 and less than 2.5.
19. Starting from the origin of the number axis, a point moves five unit lengths to the right and then eight unit lengths to the left. The number of the destination is _ _ _ _ _ _ _ _ _ _ _.
20. it is known that | a |a|=3, | b |b|=4, and a
Third, answer the question (this big question is ***7 small questions, ***80 points)
2 1.( 12) Fill in the following numbers in the corresponding set: +8.5, -3 12, 0.3, 0, -3.4, 12,-9,413.
(1) A set of positive numbers: {};
(2) Integer set: {};
(3) Negative score set: {}.
22.(8 points) Express the numbers -2, 1.5, -4, -3 12,-1) 4, -0 |+0.5 | on the number axis, and then use ".
23.( 16 points) Calculation:
( 1)6.8-(-4.2)+(-9); (2)|-2|-(-3)×(- 15);
(3)( 12+56-7 12)×(-24); (4)-24÷(23)2+3 12×(- 13)-(-0.5)2.
24.(8 points) It is known that A and B are reciprocal, C and D are reciprocal, and the absolute value of X is 2. Find the value of 3x-(A+B+CD) X 。
25.( 10) It is known that X and Y are rational numbers. Now, specify a new operation ※, which satisfies X ※ Y = XY+ 1
(1) Find the value of 2 ※ 4;
(2) Find the value of (1 ※ 4) ※ (-2);
26.( 12) The average monthly profit of "Xinchun Supermarket" 20 151~ March is 200,000 yuan, the average monthly loss from April to June is150,000 yuan, and the average monthly profit in July is ~170,000 yuan.
27.( 14 points) A goalkeeper practices turning back and running, starting from the goal line, recording forward as positive and backward as negative. His records are as follows: (unit: meter) +5, -3,-10, -8, -6,-12, -6552.
(1) Did the goalkeeper finally return to the goal line?
(2) When practicing, what is the longest distance for the goalkeeper to leave the goal line?
(3) How many meters did the goalkeeper run after all the practice?
Reference answer
1.a2 . a3 . D4 . b5 . D6 . B7 . b8 . a9 . d 10。 D
11.d12.c13.a14.c15.c16.17.30+ -2 & lt； -|+0.5 | & lt； (- 1)4 & lt； 1.5 & lt； -(-4) .23.( 1) Original formula = 2. (2) The original formula =-43. (3) The original formula =- 18. (4) The original formula =-375 12.24. According to the meaning of the question, a+. When x =-2, the original formula =-4.25. (1) 2 ※ 4 = 2× 4+1= 9. (2) (1※ 4) ※ (-2) = (1× 4+1). A: "Spring 27. (1) (+5)+(-3)+(+10)+(-8)+(-6)+(+65438+) According to observation, 5-3+10 =/kl. A: In practice, the longest distance for the goalkeeper to leave the goal line is12m. (3) |+5 |+|-3 |+ 10 |+|-8 |+.