(100 minutes out of time 100 minutes)
1. Multiple choice questions: (3 points for each small question, * * * 30 points)
1. The following statement is true ()
① The maximum negative integer is-1; (2) The distance between the points representing the numbers 2 and -2 on the number axis and the origin is equal; ③ 1.6 1 × 104 is accurate to one percent; ④a+5 must be greater than A; (5) (-2) 3 and -23 are equal.
A.2 B.3 C.4 D.5
2. If m and n are antonyms, the following conclusion may not be correct ().
A.m+n=0 B.m2=n2 C.│m│=│n│ D。
3. In the following surveys, data must be collected by sampling survey ().
① Check the service life of a large number of bulbs; (2) Investigate the household income of a city;
③ Understand the height of the whole class; (4) Check the curative effect of drugs.
A. 1
As shown in the picture, an evening newspaper "People's Hotline" received popularity within a week.
Statistical table of telephone lines, in which the telephones related to environmental protection are the most,
***70 So, this week, People Hotline received a hotline call.
The number is ()
100
5. The following figure (as shown) cannot be folded into a cube ().
6. If (a+ 1)2+│b-2│=0, then a6(-a+2b) is equal to ().
a . 5 B- 5 c . 3d-3
7. The deformation of the following four equations is correct ().
a . 4x+8 = 0x+2 = 0； b . x+7 = 5-3x 4x = 2； c . = 3 2x = 15； D.-4x=-2 x=-2
8. The following must be true: ()
①a2 =(-a)2； ②a3 =(-a)3； ③-a2 = │- a2│； ④a3=│-a3│
1。
9. Rotate the triangle around the straight line I once, and you can get the three-dimensional figure shown in the left figure ().
10. If the object is as shown in Figure A, the top view of these two objects should be ().
Fill in the blanks: (3 points for each small question, * * * 24 points)
1 1. If the solution of equation -x- a=-3 is -4, then a = _ _ _ _ _ _
12. As shown in Figure 5, the cardboard can be folded along the dotted line to make a cube. This cube, the opposite of the second face of this cube is the second face.
13. Open the math book and read three pages in a row. If the sum of the page numbers is 453, the page numbers of these three pages are _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _.
The number of trapezoids is 1 2345. ...
Graphic perimeter 58111417. ...
14. Answer this question after observing the following figures and the data in the given table sample.
When the circumference of the graph is 80, the number of trapeziums is _ _ _ _ _ _ _ _.
15. divisor 3. 1× 105 is accurate to _ _ _ _ _ _ _ _, with _ _ _ _ significant digits.
16. If the complementary angle of an angle is 3 times larger than its complementary angle 10, then the angle is equal to _ _ _ _ _.
17. At the beginning of school, all the boys in the class have to take a pull-up, with 8 times as the standard. The number of times exceeded is represented by a positive number, and the number of times insufficient is represented by a negative number. The results of the boys in this class are as follows:
Grade 2-1 0 3 -2 -3 1 4
Numbers 4 3 3 4 5 4 5 2
Then the success rate of boys in this class is probably: _ _ _ _ _ _.
18. A shop raised the original price of a microwave oven by 40%, then marked it and sold it at a 20% discount. As a result, each microwave oven earned 180 yuan more than the original price, and the original price of this microwave oven was _ _ _ _ _ _.
Three. Answer: (46 points)
19. Calculation: .20. Solve the equation:.
2 1. Shareholder Xiao Zhang bought 1000 shares of a company last Friday at 14.80 yuan each. The following table shows the daily ups and downs of the stock from Monday to Friday in the second week (unit: yuan):
Monday, Tuesday, Wednesday, Thursday and Friday.
Up and down per share +0.4 +0.5 -0. 1 -0.2 +0.4.
(1) What was the share price at the close of Wednesday?
(2) How much is the highest share this week? What is the lowest price per share?
(3) It is known that Xiao Zhang paid a handling fee of 0. 15% of the turnover when he bought the stock, and paid a handling fee of 0. 15% of the turnover and a transaction tax of 0. 1% when he sold it. If Xiao Zhang sells all his stocks before Friday's close, what is his profit? (8 points)
22. As shown in Figure 7, it is a statistical chart of a class's math exam results (the score is a positive integer, and the full score is 100). Please observe the chart and answer the following questions:
How many students are there in this class? (2) What is the passing rate (60 points) of this course?
(3) How many people in this class have more than 80 points? (8 points)
23. As shown in the figure, it is known that ∠BOC=2∠AOB, OD bisects ∠ AOC, ∠ BOD = 14. Find the degree of ∠AOB. (9 points)
24. A city collects water charges according to the following regulations: if the monthly water consumption of each household does not exceed 20 cubic meters, the water price per cubic meter is charged at 1.2 yuan; More than 20 cubic meters, the excess is charged by 2 yuan per cubic meter. If the average water price paid by a household in a month is 1.5 yuan per cubic meter, how many cubic meters of water will he use this month? (9 points)