1. In the following curve, it cannot be said that y is a function of x:
2. In the following functions, the range of the independent variable x is x≥2:
A.y= B.y= C.y= D.y=
3. Regarding the function y = x, the following conclusion is correct:
A. The function image must pass through the point (1, 2 2) B. The function image passes through two or four quadrants.
C.y increases with the increase of X, and D.Y decreases with the increase of X.
Xiao Ming shows his weekly expenditure with a statistical chart. The following statement is correct:
A. The specific message volume can be directly seen from the diagram.
B. you can directly see the total consumption from the picture.
C. From the figure, you can directly see the percentage of each consumption amount to the total consumption amount.
D. From the picture, you can directly see the specific changes of various consumption amounts in a week.
5. A sample with 50 data belongs to a group with a frequency of 0.3, so the frequency of the data in this group among the 50 data is:
15 D.3
6. In the sector statistical chart, the area ratio of each sector is 5: 4: 3: 2: 1, where the center of the largest sector is:
150
7. Determine △ ABC △ continuously under the following conditions:
A.∠A =∞，∠C =∞，AC = b .∠A =∞，AB=，BC=
C.∠B =∞，∠C =∞，AC= D.BA=，BC=，AC=
8. As shown in the figure, △ ABC △ bad, points A and B, and points C and D are corresponding points. If AB = 8cm, BC = 4cm and AC = 6cm, then the length of BD+AD is:
A.14cm B.12cm C.10cm D.10cm or12cm.
9. The following conclusions about the linear function y =-2x+ 1:
①y decreases with the increase of X ② The image is parallel to the straight line Y =-2x. ③ The coordinate of the intersection between the image and the Y axis is (0, 1).
④ The image passes through the first, second and fourth quadrants. Among them, the correct ones are:
A.4 B.3 C.2 D. 1
10. As shown in the figure, △ABE and △ADC are formed by △ABC folding along AB and AC edges 180 respectively.
If ∠ 1: ∠ 2: ∠ 3 = 28: 5: 3, then ∠ is:
A.80 B. 100 C.60 D.45
Fill in the blanks (3 points for each small question, 30 points for * * *)
1 1. In △ ABC △, ∠ A = ∠ and AC = are known. Please add a condition to make △ ABC△, and your condition is.
12. The side length of a square is 5cm, and the circumference of the new square obtained by subtracting its side length from xcm is ycm, so the relationship between Y and X is the range of independent variables.
13. If the coordinate of the intersection of the line Y =-x+a and the line Y = x+b is (m, 8), then a+b =.
14. Given that straight lines Y = x-2 and Y =-x+2 intersect at point (2,0), the solution set of inequality X-2 ≥-x is.
15. As shown in the figure, the results of a math test in a class are statistically analyzed, and the frequency line chart is obtained. The excellent rate of this test (above 80 points is excellent) is.
16. The maximum number of a set of data is 80, and the minimum number is 50. If the interval between groups is 5, then this set of data will be grouped.
17. A middle school conducted a sampling survey of 200 students about the reasons for their lack of sleep, and made the survey results into a fan-shaped statistical chart (pictured). From the information in the chart, it can be seen that the main reason for students' lack of sleep is that there are too many homework.
18. The picture shows the fan-shaped statistical chart of the distribution of gold medals in the 2006 Doha Asian Games. It is known that Japan has won 50 gold medals, and the number of gold medals won by China is estimated by the fan-shaped statistical chart.
19. as shown in the figure, in △ABC, AD = DE, AB = BE, ∠ CED = 70, then ∠ A =.
20. As shown in the figure, in △ABC, ∠ C = 90, AC = BC, AD divides ∠CAB at BC at point D, and DE⊥AB at point E. If the circumference of △DBE is 16cm, the length of AB side is.
Third, answer the question (this big question ***7 small questions, out of 60 points)
2 1.(6 points× 2 =12 points)
(1) The image passing points (-4,8) and (6,3) of the linear function are known.
Find the analytical expression of this function.
(2) Draw an image of function y = 2x-6, and use the image to find the value range of x if-6 ≤ y ≤ 0.
22.(8 points) As shown in the figure, l 1 represents the relationship between sales revenue of Shenfeng Motorcycle Factory and motorcycle sales; L2 represents the relationship between daily sales cost and sales volume of motorcycle factory.
(1) Write the functional relationship between sales revenue and sales volume;
(2) Write the functional relationship between sales cost and sales volume;
(3) When the number of vehicles sold in a day is what, the sales revenue is equal to the sales cost?
(4) When the number of vehicles sold in one day exceeds, the factory can make a profit (profit = revenue-cost)?
23.(8 points) The Physical Education Committee of a middle school counted the number of times the whole class skipped rope for 60 seconds, and listed the following frequency distribution table:
Multiply by x
60≤x 233，
∵x is an integer, ∴ x = 234 (sheets) .4 points.
(3) The amusement park is closed for one day (or a ticket is not sold), resulting in a loss of 1000 yuan. Six points.
(4) When the playground sells 100 tickets every day, it won't lose money or make money, and the playground can sell up to 300 tickets. Eight points.