2. The approximate value of a three-digit decimal after rounding is 8.30, and the original maximum value of this number is _ _ _ _ _ _ _.

3. A school carried out the selection of "excellent young pioneers" and "good citizens", and "excellent young pioneers" accounted for the number of people in the evaluation. There are 44 people who have won two titles at the same time, and only _ _ _ _ _ _ _ _ _ _ _

4. In a subtraction formula, the ratio of difference to subtrahend is 3:5, and subtrahend is _ _ _ _ _ _ _% of subtrahend.

The original price of a radio is 100 yuan. First raise the price by 10%, and then lower the price by 10%. Now the price is _ _ _ _ _ _ _.

6. The perimeter of a rectangle is equal to the perimeter of a square, and the length-width ratio of a rectangle is 5:3. Given that the area of a square is 4 square centimeters, the area of a rectangle is _ _ _ _ _ _ _ _.

7. As shown in the figure, in a square with a side length of 3, from top to bottom, from left to right, from front to back, a square with a bottom area of 1 and a height of 3 has three holes, then the surface area of this geometric figure is _ _ _ _ _ _ _ _.

(7 maps) (10 maps)

8. A magazine is sold by the wholesaler to the bookstall at a discount of 30%, and the stall owner sells it to the readers at a reduced price of 10% of the original price. If this magazine is sold in 7.2 yuan, the stall owner will make a profit of _ _ _ _ _ _ _ _ yuan for every copy sold.

9.△+△ = A, △-△ = B, △×△ = C, △÷△=d, a+b+c+d= 100, then △ _ _ _ _ _.

10. Arrange positive integers 1, 2, 3, 4 ... Turn at positions 2, 3, 5, 7, 10 in the direction indicated by the arrow (as shown in the figure), then the number of the 50th turn is _ _ _ _ _ _ _.

Score 2. Multiple choice questions: (2 points for each small question, ***20 points)

Second, multiple-choice questions: (2 points for each small question, ***20 points)

1 1. If you use □ to represent a cube, use □ to represent the superposition of two cubes, and use ■ to represent the superposition of three cubes, then the geometry of the superposition of seven cubes in the right picture can be drawn as a plane figure () from the front.

A.B. C. D。

12. If you flip a coin three times, two heads are up and 1 tails are up, then the possibility of the fourth coin flip is ().

65438 AD+0 BC

13. The length, width and height of a cuboid are a meter, b meter and h meter respectively. If the height increases by 4 meters, the volume will increase ().

A.4bh B.4abh C.4ab D.ab(h+4)

14. There are five pieces of wood, and their lengths are 1cm, 2cm, 3cm, 4cm and 5cm respectively. Choose three pieces of wood from them to make a triangle, and one can make a triangle.

A. one b, two c, three d and four.

15. If x= 135679×97543 1, y= 135678×975432, the relationship between x and y is ().

A.x < y b.x > y c.x = y D. I'm not sure.

16. Knead a cylindrical plasticine into a cone with the same bottom, and lift it ().

A.6 times smaller B. 3 times smaller C. 6 times larger D. 3 times larger.

17. Add 6g of salt,14g of water to the salt water with a salt content of 30%. At this time, the salt content of brine is ().

A. equal to 30% B. less than 30% C. greater than 30% D. uncertain

18. If 72÷x2=y3, and both X and Y are natural numbers, then the minimum value of X is ().

A.2 B.3 C.4 D.5

19. Xiaogang went to school from home and then went back the same way. He walked m meters every minute when he went there and n meters every minute when he came back. The average speed of Xiao Gang's going back and forth is () meters per minute.

A.(m+n)÷2 b . 2mn÷(m+n)c . 1÷(m+n)d . 2÷(m+n)

20. The developer sells the house by installment. Zhang Mingjia bought a new house, and the current price is 1.2 million yuan. When buying a house, he needs a down payment of 30,000 yuan (the first year). Starting from the second year, he will pay 5000 yuan a year. The sum of the interest of the remaining arrears in the previous year shows that the annual interest rate of the remaining arrears is 0.4%. In (), Zhang Mingjia needs to pay 5,200 yuan for the house.

A.7 B.8 C.9 D. 10

Score 3. Calculation problem: (5 points for each small question, ***35 points)

2 1.84×[ 10.8÷(48.6+5.4)-0.2] 22.[( -4.25)× ]÷ +3.3÷

23.24. 1-3+5-7+9- 1 1+ 13-…-39+4 1

25.× + × + × 26.+ + +

27.( 1- )×( 1- )×( 1- )×…×( 1- )

Score 4. Graphic calculation questions (5 points for each small question, *** 10)

28. The square grassland is increased by 5 meters on each side, and it is still a square grassland after expansion, with an area of 425 square meters more than the original square grassland. Find the side length of the original square grassland.

29. As shown in the figure, in the triangle ABC, CD= BD and DE=EA. If the area of triangle ABC is 10, what is the area of the shaded part?

Score 5. Application questions: (30,31,6 points for 32 questions, 7 points for 33 questions and 25 points for * *).

On Arbor Day, Xiaoming, Xiaohong, Xiaoyue and Xiaokang planted 120 trees. Xiaoming planted half the trees planted by other students, Xiaohong planted a third and Xiaoyue planted a quarter. Do you know how many trees well-off students have planted?

3 1. A shop sells two different clothes, both of which are sold in 240 yuan. According to the cost calculation, one of them earned a fifth and the other lost a fifth. After selling clothes, did the store make a profit or lose money? What is the difference?

32. A project needs 15 days for team A, 15 days for team B, and 20 days for team C.. At the beginning, three teams worked together, team A quit halfway, and two teams, B and C, completed the remaining projects together. Finally, it took six days to complete the project. So how many days did Team A actually work?

Walking from home to school tomorrow morning, dad found Xiaoming's math textbook at home, so he drove to deliver it to Xiaoming. When catching up, Xiao Ming got on his father's car and was sent to school by his father. In this way, Xiao Ming arrived at school five minutes earlier than walking alone. How long does it take Xiaoming to walk from home to school?