Total score of the first, second and third place
Take the lead
1. Fill in the blanks (3 points for each small question, 30 points for * * *)
1.- 1-(-3)= 。
2. The absolute value of-0.5 is, the reciprocal is, and the reciprocal is.
3. The single factor is, and the number is.
4. If the counterclockwise rotation of 90o is marked as+1, then -2 means.
5. If A and B are antonyms and X and Y are reciprocal, then (a+b) -xy+a2-b2=.
6. On the number axis, point A represents the number-1, and the point 2.5 unit lengths away from point A represents the number.
7. The disaster is merciless! In an earthquake relief performance, artists and people from all walks of life donated 3.498 million yuan to the people in the earthquake-stricken areas. This number is expressed by scientific counting method, and three significant figures are reserved as elements.
8. The length of a rectangle is one meter. If the width is less than twice the length times b meters, the width is meters.
9. If m and n satisfy =0, then
10. The output value of a factory in June was 54.38+002500 yuan, which was130000 yuan less than that in March. If the output value in March is X million yuan, the equation can be listed as follows
Second, make your choice (3 points for each small question, 30 points for * * *)
1 1. If 2km to the east is marked as +2km, then -3 km means ().
A. Go 3 kilometers east. B. Go 3 kilometers south. C. Go 3 kilometers west. D. Go 3 kilometers north.
12. The following statement is true (c)
The coefficient of A.x is 0 b. It is the term C. 1 and the monomial D.-4x coefficient is 4.
13. The following groups are similar projects ().
A.4x and 4y B.4xy2 and 4xy C.4xy2 and -8x2y D.-4xy2 and 4y2x
14. In the following groups, () are opposite to each other.
① ② ③ ④
A.④ B.①② C.①②③ D.①②④
15. if A+B
The symbols of a, a and b are the same, but the symbols of b, a and b are different, so the absolute value of negative numbers is large.
The symbols of C.A. and B are different, and the absolute value of positive numbers is large. D or more is possible.
16. The following calculation is correct ()
A.4x-9x+6x=-x B.xy-2xy=3xy
C x3-x2 = x d a-a = 0 17。 The number corresponding to point M on the number axis is -2, so move point M to the right by 4 unit lengths, and the number represented by point M at this time is ().
A.-6 B. 2 C.-6 or 2 D. is incorrect
18. If the reciprocal of is 3, then the value of x+y is ().
A.-8 b.2 c.8 or -2d-8 or 2
19. If 3x = 6 and 2y = 4, the value of 5x+4y is ().
A. 18 B. 15 C.9 D. 6
20. If the sum of -3x2m and 5x2n-3y8 is a monomial, the values of m and n are () respectively.
A.m=2，n=2 B.m=4，n= 1 C.m=4，n=2 D.m=2，n=3
Third, answer with your heart (***60 points)
2 1.( 16 points) calculation
( 1) -26-(- 15) (2)(+7)+(-4)-(-3)- 14
(3)(-3)× ÷(-2)×(- ) (4)-(3-5)+32×(-3)
22. Solve equations (8 points for this question)
( 1)x+3x =- 12(2)3x+7 = 32-2x
23.(6 points) Represent the following numbers on the number axis and use ""
-22, -(- 1), 0, , -2.5
24.(6 points) If A is the smallest absolute value, B is the largest negative integer. Simplify first, then evaluate:
25.(6 points) Solve application problems with series equations.
Distribute a batch of books to a class of students to read. If each student is divided into three books, there are still 20 books left. If each student is divided into four books, there will be a shortage of 25 books. How many students are there in this class?
26.(9 points) Taxi driver Xiao Li was operating on Dongxi Street one morning. If it is stipulated that the east is due west is negative, then the mileage (unit: km) of the six passengers he picked up this morning is as follows: -2, -5,-1,-1, -6, -2.
(1) Where was Xiao Li when the last passenger was delivered to the destination?
(2) If the fuel consumption of the car is 0.2L/km (liter /km), how many liters will the taxi * * * consume when Xiao Li picks up passengers this morning?
(3) If the taxi starts at 8 yuan with a mileage of 3km (including 3km), which is more than 1.2 yuan per kilometer, ask Xiao Li how much the fare is this morning.
27.(9 points) Starting from 2, continuous even numbers are added, and their sum is as follows:
The number of addend n
1 2 = 1×2
2 2+4 = 6 = 2×3
3 2+4+6 = 12 = 3×4
4 2+4+6+8 = 20 = 4×5
5 2+4+6+8+ 10 = 30 = 5×6
(1) If n=8, the value of s is _ _ _ _ _ _ _.
(2) According to the rules in the table, guess: the formula for expressing S with the formula of n is:
S=2+4+6+8+…+2n=____________。
(3) Calculate the value of 2+4+6+8+10+…+98+100 according to the law of the above question.
The answer to the seventh grade math test questions
Fill in perfectly (3 points for each small question, 30 points for * * *)
1, 2 2, 0.5, 0.5, -2 3, 3 4, rotate clockwise 180o 5,-1 6, -3.5 or 1.5 7, 3.50× 106.
8、2a-b 9、9 10、3x- 13= 125
Make your choice (3 points for each small question, 30 points for * * *)
1 1、C 12、C 13、D 14、B 15、D 16、D 17、B 18、D 19、A 20、C
Three. Answer with your heart (***60) 2 1, (16) (1)-1(2) 8.
(3)- (4)-25
22, (8 o'clock) (1) x =-3 (2) x = 25.
23, (6 points) -22 points
24, (6 points) solution: from the meaning of the question, a=0, b=- 1.
Original formula =2a2-4ab-2b2-a2+3ab+3b2.
=a2-ab+b2
When a = 0 and b =- 1, the original formula =(- 1)2= 1.
There are 45 students in this class.
26.(9 points) Solution: (1)-2+5-1+1-6-2 =-5.
A: Xiao Li is in the starting position 5 kilometers west.
(2)
=2+5+ 1+ 1+6+2= 17 17×0,2=3.4
A: Taxis * * * consume 3.4 liters of fuel.
(3)6×8+(2+3)× 1.2=54
Answer: Xiao Li sent the fare to 54 yuan this morning.
27, (9 points) (1) 72; (2) ;
(3)2+4+6+8+ 10+…+98+ 100=50×5 1=2550