1. If you walk 5 meters south and mark it as +5 meters, then walk 8 meters north and mark it as _ _ _ _ _ _ _ _ _ _ _ _ _ _.

2. If the temperature rises by 3℃ and is recorded as +3℃, the temperature drops by 5℃ and is recorded as _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

3. The altitude is+1356m, which means _ _ _ _ _, and the altitude is -254m, which means _ _ _ _ _. The solution is altitude 1356m and altitude is 254m m.

4. The inner 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 maximum machining requirement is not greater than _ _ _ _ _ _ mm and the minimum is not less than _ _ _ _ _ _ _ _.

Solution-30.05; 29.95

On May 6, 2005, 0, -3,+1, -6.8, positive integers and negative fractions * * * have … [] solutions to C.

A.3 B.4 C.5 D.6

6. Fill in the following figures in the corresponding brackets:

+9,- 1,+3, ,0, ,- 15, , 1.7.

A set of positive numbers: {+9, +3, 1.7...},

Negative set: {- 1- 15...}.

7. If the average score of a math exam in the whole class is 83 points, and a classmate scores 85 points, it will be recorded as +2 points, and the scores of 90 points and 80 points will be recorded as _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ -3

8. If +2 10 yuan means the income of 2 10 yuan, then -60 yuan means _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _.

9. If the grain output increases by 1 1% and is recorded as+1 1%, the decrease of 6% should be recorded as _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _.

10. If 2008 is recorded as +2008, then -20 years means _ _ _ _ _ _ _. Solution 1988.

1 1. If going west 12m is marked as+12m, then going east-120m is _ _. It means going west 120 meters.

12. In the word "500 5g" marked on the monosodium glutamate packaging bag, +5 means _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _.

The solution does not exceed 5g; Not less than 5 grams.

13. Measure the length of a highway bridge, and the data obtained each time are: 255m, 270m, 265m, 267m and 258m. (1) Find the average of these five measurements; Solve 263 meters;

(2) If the obtained average value is a reference number, the difference between the numerical value and the average value of each measurement is represented by positive and negative numbers;

Answer -8, 7, 2, 4, -5

14. Party A and Party B start from place A at the same time. If Party A walks 50m south, which means +50m, then Party B walks 30m north. Why? At this time, how many meters are A and B apart? Solution-30m; ; 80 meters

15. Aunt Zhang bought a bag of washing powder in the supermarket and found a note on the package: net weight: 800 5g ... Aunt Zhang didn't understand what it meant. Can you explain it to her?

The weight of the detergent is 795-805g.

16. In the market economy, the calculation formula of profit is: profit = sales revenue-sales cost. Liang Xiao used this formula to calculate the profit of his father's shop on a certain day as -25 yuan. -What do you mean by profit in 25 yuan?

Pay 25 yuan.

17. In a certain year, a foreign debt 10 billion US dollars and a domestic debt 10 billion US dollars. Applying mathematical knowledge to explain, the following statement is reasonable ().

A. If the foreign debt is-65.438+0 billion dollars, the domestic debt is+65.438+0 billion dollars.

B. The domestic and foreign debts of this country cancel each other out.

C. This country owes * * * 2 billion dollars.

D. this country has no money

Solution c

18. Fill in the appropriate words on the following horizontal lines, so that the front and back constitute quantities with opposite meanings:

(1) The income is 1300 yuan, 800 yuan; Solution expenditure

(2) 80 meters, down 64 meters; Solution rising

(3) March 30 meters north and 50 meters south.

19. Observe the numbers in each column in the following arrangement and study the regularity of their arrangement. And fill in the numbers in the blanks.

(1) 1, -2, 1, -2, 1, -2, … solution 1, -2, 1.

(2)-2,4,-6,8,-10, … solution 12,-14

(3) 1, 0,-1, 0,-1,... solution1,0,-1.

20. The temperature of A cold storage is-12℃, and the temperature of B cold storage is 5℃ lower than that of A cold storage, so the temperature of B cold storage is.

Solution-17

22. The inner diameter of a part on the drawing is 9 0.05 (unit: mm), which means the standard size of this part is 9mm. What is the maximum machining requirement? What is the minimum size not less than the standard size? Solution 9.05 mm, 8.95 mm

The motorcycle factory plans to produce 250 motorcycles every day this week. Because workers take turns off, the number of people who go to work every day is not necessarily equal. The actual daily output (compared with the planned quantity) is increased as follows:

Monday, 23456

Increase or decrease -5+7-3+4+ 10-9-25

According to the above records, Q: In which days did you produce more motorcycles than planned? On which day of the week do you produce the most motorcycles? How many motorcycles are there? What day of the week produces the least number of motorcycles? How many?

Tuesday, Thursday and Friday; 260 vehicles on Friday; 225 cars on Sunday.

Second set

1. If the temperature rises by 3 degrees to +3 degrees and falls by 5 degrees to -5 degrees, what do the following quantities mean respectively?

(1)+5 degrees; (2)-6 degrees; (3)0 degrees

2. East -8 meters means ()

A.walk 8 meters east. B.walk 8 meters west. C. go west -8 meters. D. none of the above is true.

3. The following statement: (1) All integers are positive numbers; (2) The score is a rational number; (3) All positive numbers are integers; (4) In rational numbers, all except negative numbers are positive numbers, and the correct statement is ().

1。

4. Among the following statements, the correct one is ()

A. Positive and negative integers are collectively referred to as integer b, and positive and negative fractions are collectively referred to as rational numbers.

C zero can be a positive integer or a negative fraction d, and all fractions are rational numbers.

5. Which of the following figures are negative?

- ,-0,-(-2),+2,3,-0.0 1,-0.2 1,5%,-(+2)

6. Which of the following numbers belong to positive set, negative set, non-negative set, integer set, fractional set and rational number set?

- 1,-3. 14 156,- ,-5%,-6.3,2006,-0. 1,30000,200%,0,-0.0 100 1

7. Given three groups of numbers A, B and C, the numbers contained in each group are written in their own braces. Please fill these numbers in the corresponding positions in the circle as shown in Figure 2- 1- 1, where A={-2, -3, -8, 6, 7}; B={-3，-5， 1，2，6 }； C={- 1，-3，-8，2，5)。

The average water level of the reservoir is 80 meters. On this basis, if the water level changes, the water level rise is recorded as a positive number; The reservoir manager recorded the water level changes (in meters) from March to August: -5, -4, 0, +3, +6 and +8. What is the actual water level in these months?

9. If the income 15 yuan is recorded as+15 yuan, then the expenditure 20 yuan is recorded as _ _ _ _ _ _ _.

10. A food packaging bag is marked with "net content 385 5", and the acceptable net content range of the packaged food is _ _ _ _ _ _ g ~ 300g.

1 1. The following statement is true ()

A. positive numbers and negative numbers are collectively called rational numbers. B.0 is an integer, but not a positive number.

C.0 is the smallest number and D.0 is the smallest positive number.

12. The following quantity with no opposite meaning is ()

A. Forward 5 meters, backward 5 meters. B. Save 3 tons and consume 10 tons.

C. The height increased by 2cm and the weight decreased by 2kg. D. more than 5g and less than 2g.

13. The following statement is true ()

A. Rational numbers refer to five categories: integer, fraction, zero, positive rational number and negative rational number.

B. Rational numbers are either positive or negative.

C. the rational number is either an integer or a fraction d. All the above statements are correct.

14. Fill in the following numbers in the corresponding brackets respectively: -3, 4, -0.5, -0.86, 0.8, 8.7, 0, -7.

Positive rational number set: {…};

Non-negative rational number set: {…};

Integer set: {…};

Negative diversity: {…}.

15. The income and expenditure of a store in one week are as follows.

Date one two three four five six

Expenditure (ten thousand yuan) 1.8 0.8 2.5

Income (ten thousand yuan) 2 1.5 1 2

Use what you have learned to make a simple account for the store.

16. Write five numbers and meet three conditions at the same time: (1) Three of them belong to non-positive sets; (2) Three numbers belong to a nonnegative set; (3) These five numbers all belong to an integer set.

17. Confucius was born in 55 BC1year. If -55 1 is used, then Li Bai was born in 70 1 year, which can be expressed as a _ _ _ _ _ _ _.

18. The standard price of a commodity is 200 yuan, but with the change of seasons, the price of a commodity may fluctuate by 10%. Think about it.

What do you mean by (1) 10%?

Please work out the highest and lowest prices of this commodity;

(3) If the standard price is taken as the standard, the price exceeding the standard is indicated by "+",and the price below the standard is indicated by "-",how to express the fluctuation range of commodity prices?

19. The integers less than-1 are arranged as follows.

The first, second, third and fourth columns.

-2 -3 -4 -5

-9 -8 -7 -6

- 10 - 1 1 - 12 - 13

- 17 - 16 - 15 - 14

… … … …

In these numbers, observe their laws, and in which column will the answer number-100 be?