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9. Among the following inequalities, the solution set is X >；; The inequality of 1 is () a.3x >:-3b.34xc.2x+3 >; 5 D.-2x+3 >5 10. The solution set of the inequality shown below is ().

A.23x？ B.23x≤ C.23x？ ≤ D.23x≤

1 1. Given the solution set of two inequalities on the number axis as shown in the figure, the solution set of the inequality group composed of these two inequalities is ().

A.-2≤x2

12. The sum of all integer solutions of inequality -3 < x ≤ 2 is ()

A.0 B.6 C.-3 D.3

13. If the maximum internal angle of a triangle is 60, then the triangle is ().

A. equilateral triangle B. isosceles triangle C. equilateral triangle D. indefinite

14. The bisector, midline and height of the triangle (). Are all the line segments B? ..

C. it's all rays. D. Angle bisector, with the center line as ray and the height as line segment.

2. Fill in the blanks: (full score 16, 4 points for each small question)

15. If 2x3-2k

+2=4 is a linear equation about x, then k=.

16. It is known that xaxxaa 1 12 is the solution of the equation, so () ().

17. If the equation? The solution of 523 1yxyx is also 3x+ay= 10, then a =.

The negative integer solution of inequality 0 145x is _ _ _ _ _ _ _.

-2 0 2

3? 2? 1? 0 1 2 3 4

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Washington D.C.

III. Solution: (This big question has a full score of 62)

19. Solve the following equation (group) or inequality (group) (5 points for each small question, * * * 20 points).

( 1))2(5 1) 12(2xx(2)2622 xyxy

①②

(3) 2 1

3xx (4)？

523 1932 XXX

20.(6 points) Given the equation 10nymx, there are two solutions, namely 2 1yx and?

12

Yx, looking for nm? The value.

2 1.(6 points) As shown in the figure, ∠ B = 60, ∠BAC = 80, AD⊥BC, AE divide ∠BAC equally, and find the degree of ∠DAE.

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22.( 10) Equation solution: Team A has 29 people, and Part B has 17 people. Now, in order to catch up with the construction period, the head office transfers another 20 people to support it, so that the number of people in Part A is twice that in Part B. How many people should be transferred to Part A and Part B?

23.( 10) Last year, a school actively organized donations to support the earthquake-stricken areas. 55 students from Class 7 (1) donated 274 yuan. The donations are as follows. The number of people who donated to 2 yuan and 5 yuan in the table was accidentally contaminated by ink, so it is not clear. Please use the equation knowledge you have learned to find out the number of people who donated to 2 yuan and 5 yuan. Donation (RMB) 60.

24.( 10 minute) A company has 1530 tons of Class A goods and 1 150 tons of Class B goods to be shipped at the railway station. It is planned to transport these goods to Beijing by 50 carriages of two models, A and B. It is known that the freight for each carriage of Type A is 5000 yuan, and that for each carriage of Type B is 500,000 yuan. 35 tons of Class A goods and 15 tons of Class B goods can fill a Class A truck, and 25 tons of Class A goods and 35 tons of Class B goods can fill a Class B truck. According to this requirement, how many schemes are there to arrange the number of sections A and B? Please design it.