The title is123455678 910121314.
answer
The reciprocal of 1 and -3 is (▲).
a、B、-3 C、-D、3
2. The following statement is correct (▲)
① Rational number can be an integer or a fraction ② Rational number can be a positive number or a negative number.
Integer can be positive or negative. The score can be positive or negative.
a、 1 B、2 C、3 D、4
3, the following formula, the correct is (▲)
a、∣-5∣ =5 B、-∣-5∣ = 5 C、d、
4. The following formula is correct (▲)
a 、(- 14)—5 =—9 B、0 —(—3)=3
c 、(—3)—(—3)=—6 D、∣5—3∣= —(5—3)
5. The following statement is true (▲)
A. Integers include positive integers and negative integers; B. Zero is an integer, but it is neither positive nor negative;
C. Scores include positive, negative and zero; Rational numbers are either positive or negative.
6. Education in China has developed rapidly. Last year, the number of college students enrolled reached 5.4 million, which was expressed by scientific notation (▲).
A.5.4 × 102 people B. 0.54× 104 people C.5.4 × 106 people D. 5.4× 107 people.
7. In the following figures, the inverse number is (▲).
A, and 0.2 B, and -0.33c, -2.25 and D, 5 and -(-5).
8. At 0,-1, ∣-2 ∣,-(-3), 5, 3.8, and the number of positive integers is (▲).
a， 1 b，2 c，3 d，4
9. School, home and bookstore are located in a north-south street in turn. The school is 20 meters south of home, and the bookstore is north of home 100 meters. Zhang Ming starts from home, walks 50 meters north, and then walks -70 meters north. At this time, Zhang Ming's position is (▲).
A. At home B. At school C. At the bookstore D. Not in the above places.
10. The height of the submarine is -60m, and the dolphin is 20m above the submarine, so the height of the dolphin is (▲).
A.-60 meters B. -80 meters C.-40 meters D.40 meters
1 1, the following statement is true (▲)
①0 is a rational number with the smallest absolute value ② The number whose reciprocal is greater than itself is a negative number.
③ The numbers on both sides of the origin on the number axis are opposite; ④ Compared with the two numbers, the absolute value is larger but smaller.
A ①② B ①③ C ①②③ D ①②③④
12. If the reciprocal of a number is greater than itself, then this number is (▲).
A. positive numbers B. negative numbers C. 0 D. negative numbers and 0
13, if it is reciprocal, and it is reciprocal, and the absolute value of is 2, then the value is (▲).
A, b, 3 C, d, 3 or
14, comparing the sizes of -2.4, -0.5, -(-2) and -3, the following is correct (▲).
a、—3 & gt； —2.4 & gt； —(—2)& gt； —0.5 B、—(—2)>—3 & gt； —2.4 & gt； —0.5
c、—(—2)>; —0.5 & gt； —2.4 & gt； —3 D、—3 & gt； —(—2)& gt； —2.4 & gt； —0.5
Fill in the blanks: (2 points for each question, *** 16 points)
The reciprocal of 15 is, and the reciprocal of is.
16, if it is marked as-6m when going westward for 6m, then it is marked as _ _ _ _ _ _ when going eastward for10m; If a 5% reduction in output is recorded as -5%, then 20% means _ _ _ _ _ _.
17. the temperature in Huai' an city was 5℃ in the morning and increased by 3℃ at noon. In the afternoon, due to the cold air heading south, it dropped by 9℃ at night, so the temperature at night was℃.
18. If noon is 0 hours and 3 pm is +3 hours, then 8 am can be expressed as.
19, the rational number with the smallest absolute value is _ _ _ _. The number whose absolute value is equal to itself is
20. It is known that Chicago is behind Beijing time 14 hour. Q: Beijing time is September 2 1 8: 00 am, and Chicago time is September Sunday.
2 1, can you play the game "2 1 point"? Please select four numbers from the five numbers "2, -3, 4, -5, 6", and use the mixed operation of rational numbers to make the operation result of four numbers 24 (each number can only be used once). Write your formula (only one) _ _ _ _ _ _ _.
22. Observe the following numbers:-1, 2, -3, 4, -5, 6, -7, ... and arrange the column numbers in the following form:
According to the above rules, the ninth number from the left of line 10 is _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _.
Third, answer questions:
23. Calculation: (5+5+5+5+6+6=32 points)
( 1)-6 -(-2)2 ; (2 )-3×(-2)+3-8 ;
(3)( 38 + 16 - 34 )×(—24) (4)
(5)-32÷(-3)2+3×(-6) (6)
24.(6 points) Draw points representing-1 .5,2,-1and its antonyms on the number axis.
25.(6 points) The book borrowing and lending records of Huaihai Middle School Library last week are as follows: (The book records above 100 are positive, and those below 100 are negative).
Monday Tuesday Wednesday Thursday Friday
+23 0 - 17 +6 - 12
How many books did you borrow last Friday?
How many more books did you borrow last Thursday than last Wednesday?
(3) How many books were lent out every day last week?
26.(6 points) The expressway maintenance team will patrol and maintain the east-west expressway. If the agreed east is due west and negative, the driving record of that day is as follows (unit: km) (8 points).
+ 17,-9,+7,- 15,-3,+ 1 1,-6,-8,+5,+ 16
(1) What is the last starting point of the maintenance team? How far is it from the starting point?
(2) How far is it from the starting point in the curing process?
(3) If the fuel consumption of a car is one liter/km, how many liters will it consume this time?
27.(6 points) Observe the following equations,,,
Add will to both sides of the above three equations.
(1) Guess and write. (2) Write the following calculation results directly:
;
(3) Exploration and calculation:
28.(5 points) Pass this monthly exam and talk about how to learn mathematics in the future.
Congratulations on completing this exam! Check it again carefully and try to get a satisfactory result. )