Dreaming is just a kind of intelligence, and realizing dreams is a kind of ability. The following is the 20 17 seventh grade math final examination paper I compiled. Let's have a look.

1. multiple-choice questions (this big question * * 12 small questions, 3 points for each small question, 36 points for * * *. ): There is only one correct answer to each of the following small questions. Please fill in the answer sheet.

The reciprocal of 1 -3 is ()

A.B. ﹣3

2. The result of calculating 3 | (3 |) is ().

A. 6 BC, 3 BC, 0 BC-6

3. The value of (-2) 3 is ()

A.﹣5·﹣6·﹣8·﹣9

4. The temperature of a city on a certain day is -2℃ ~ 6℃, so the temperature difference on that day is ().

A.8℃ B. 6℃ C. 4℃ D-2℃

5. The distance between Party A and Party B is about 12 900m, and 12 900m can be recorded as () by scientific notation.

A. 129? 102m B. 12.9？ 103m C. 1.29？ 104m D. 0. 129？ 105m

6. Calculation, the result is equal to ()

A.5b.-5 AD 65438 +0

7. Two of the following questions are similar ().

A.ab2 and B. xy3 and x2y2 C. x2 and y2 D. 3 and -5

8. The following calculation is correct ()

A.3a+2b = 5ab b 5y2﹣3y2=2

C.﹣ 12x+7x=﹣5x·4m2n﹣2mn2=2mn

9. The whole class is arranged in a long rectangular queue, and the number of students in each row is A, and the number of rows is 2 times more than the number of students in each row, so the number of students in the whole class is ()

A. answer? 3a+2 B. 3a(a+2) C. a+3a+2 D. a(3a+2)

10. Rational number 3.645 is accurate to the nearest percentile ().

A.3.6 B. 3.64 C. 3.7 D. 3.65

1 1. Among the following types, () belongs to the linear equation.

A.2x+5y = 6 b . 3x﹣2 c . x2 = 1d . 3x+5 = 8

12. As shown in the figure, the cube is ().

A.B. C. D。

Fill in the blanks (this big question is ***8 small questions, each with 3 points and ***24 points. ): Fill the answer directly on the horizontal line behind the corresponding question number on the answer sheet.

13. The carpenter drew a line on the wood. Determine the positions of the two points first, and then they can draw lines accurately.

14. All non-negative integers not greater than 3 are.

15. As shown in the figure, fold the corner of the rectangle ABCD along AE. If? Not good? =30? And then what? EAD？ = ? .

16. If 2ab23x+ 1 and ﹣5abyc6x﹣5 are similar terms, then x+y=.

17. The single factor is, and the number is.

18. given that point b is on a straight line AC, AB=8cm, AC= 18cm, and P.Q is the midpoint of AB. What's the AC? What's the cm? (self-built map).

19. If A and B are reciprocal, and C and D are reciprocal, then 2a+3cd+2b=.

20. The price of each A-yuan coat will be increased by 10% first, and then the price will be RMB/piece after 10% discount.

Third, solve the problem (this big question is ***6 small questions, ***40 points. Please write down the necessary steps to solve the problem.

2 1. Calculation problem:

( 1)﹣3+ 10﹣9﹣ 10.

(2)(﹣ 1)? (﹣ )? .

(3)360? 4﹣(﹣6)2? [2﹣(﹣3)].

22. Simplify first, then evaluate:, where a =-2.

23. Represent the following numbers on the number axis: 0, -4.2, -2, +7, with? & lt？ Digital connection.

24. Solve a linear equation with one variable: 5 (x+2) = 2 (5x- 1).

25. It is known that the complementary angle of an angle is three times larger than that of this angle. 10? Find the degree of this angle.

26. The charging standard for short messages of a communication operator is: 0. 1 yuan/message in the network and 0. 15 yuan/message in the Internet. Xiao Wang, a user of communication operator, sends the above two kinds of short messages 150 every month. According to this charging standard, he spends 19 yuan on short messages.

27. The sum of all integers whose absolute value is less than 3 is.

28.a and B are reciprocal, X and Y are reciprocal, Y? 0, the value of (a+b)(x+y)-a B- is.

29. If the points represented by A, B and C on the number axis are shown in the figure, simplify | b |+| a+b | | a | c | =.

30. As the picture shows, here is a square with matchsticks. Please carefully observe the matchstick with roots (represented by the algebraic expression of n) in the nth figure.

3 1. The hour hand indicates 6: 00 15, and the angle between the hour hand and the minute hand is degrees.

32.﹣3[﹣5+( 1﹣0.2? )? (﹣2)].

33. Simplify first, then evaluate:, where.

34. A fishery plans to buy 6,000 fry of A and B, one from 0.5 yuan and one from 0.8 yuan. Relevant data show that the survival rates of A and B are 90% and 96% respectively.

(1) If it costs 3600 yuan to buy these fry, how many fry did A and B buy?

(2) What is the theoretical survival rate of these fry? (Survival rate =)

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