1. The following statement is true ()
①0 is a rational number with the smallest absolute value; ② The number whose reciprocal is greater than itself is negative;
③ The numbers on both sides of the origin on the number axis are opposite; ④ Comparing two numbers, the absolute value is larger but smaller.
A.①② B.①③ C.①②③ D.①②③④
According to relevant reports, as of April this year, China has completed the construction task of 57,800 rural teaching points. 57800 can be expressed as () by scientific notation.
A 5.78? 103 B.57.8？ 103 C.0.578？ 104 D.5.78？ 104
3. In the following formula, the smallest result is ().
A.B. C. D。
4. Among the following logarithms, the one with equal value is ().
A. And B. And
C. and D. and
5. The sum of single coefficient and times is ()
A.0 B. 1 C.- 1 D.5
6. The value of the polynomial is () A. 1 B.-1 C. 0 D. 2 When the real number is known.
7. The following statement is wrong ()
A is a monomial. B is a polynomial.
C is an algebraic expression. D is an algebraic expression.
8. For two-digit numbers, the first digit is, and the tenth digit is. If you exchange the number of one digit with the number of the tenth digit to get a new two-digit number, the sum of these two digits is ().
A.B. C. D。
Fill in the blanks (3 points for each small question, *** 18 points)
9.165438+1On October 5th, the highest temperature of a tourist attraction was 8℃, and the lowest temperature was℃, so the temperature difference of this scenic spot on this day was _ _ _ _℃.
10. It is known that p is a point on the number axis. If p is moved to the left by one unit and then to the right by one unit length, then the number represented by p is _ _ _ _ _.
1 1. Calculate 1-2+3-4+5-6+? The value of+2011-2012 is _ _ _ _.
12. If = 1 and the value of algebra is 5, then =- 1 and the value of algebra is _ _.
13. The circumference of a rectangle is 24 cm. If the width is increased by 2 cm, it can become a square. Then the width of this rectangle is.
14. The bus * * * had a passenger, got off halfway and got on a passenger. At this time, the bus * * * has the passenger name.
Iii. Answer: (There are 3 small questions in this question, each with 6 points, *** 18 points)
15. Calculation:
16. Calculation:
17. Merge similar projects:
4. Answer: (There are 3 small questions in this question, with 8 points for each small question and 24 points for * * *).
18. Simplify before evaluating.
19. As shown in the figure, when and when, find the perimeter and area of the shadow part.
20. A stone began to fall freely from the height of 176.4, and the height of falling rock is related to time:
time
height
(1) Write a formula to express the falling height with time;
(2) Find the height of falling rocks.
Verb (abbreviation of verb) solution: (This problem is *** 10)
22. In order to save water resources, a city has formulated the water consumption standard for residents. It is stipulated that the monthly water consumption of each household should not exceed 8 cubic meters, and the charge per cubic meter is 1.3 yuan; Each household exceeds 8 cubic meters per month, and the excess is charged at 2.8 yuan per cubic meter.
(1) Let a household use x cubic meters of water in a certain month, and write it when it is 0.
(2) Xiaojie's family used 23 cubic meters of water in June 5438+February 2006. How much water did Xiaojie's family have to pay from June to February in 5438?
The reference answer to the midterm examination questions in seventh grade mathematics 1. Multiple choice questions: (3 points for each small question, ***24 points)
1.a； 2.d； 3.A 4。 a； 5.b； 6.b； 7.a； 8.C
Fill in the blanks (3 points for each small question, *** 18 points)
9. 10 ; 10.-6 ; 1 1.- 1 006; 12.3 ; 13.5cm; 14.
Iii. Answer: (There are 3 small questions in this question, each with 7 points, ***2 1 point)
15.=-4
16.
.
17.
4. Answer: (There are 3 small questions in this question, with 9 points for each small question and 27 points for * * *).
18. solution: original formula =,
When, the original formula =27
19. Solution: The perimeter of the shaded part is;
The shaded part is.
20.( 1)
(2),
Verb (abbreviation of verb) solution: (This problem is *** 10)
2 1. Solution: (1) When 0
When x>8 o'clock, the water fee should be paid [1.3? 8+2.8(x-8)] yuan or (2.8x- 12) yuan;
(2) When x=23, 2.8x- 12=2.8? 23- 12=52.4 yuan.
Answer: The water fee payable by Xiaojie's family in February is 52.4 yuan.