Class: Grade 7 () Class Name Score:
Please write the correct answers in the following table for multiple-choice questions (3 points for each question, 30 points for * * *).
1 2 3 4 5 6 7 8 9 10
1. The water level of the reservoir is 2m higher than the normal water level, marked as +2m, and 3m lower than the normal water level, marked as ().
A. BC +3 million years+BC -3 million years
2. Following the successful launch and safe return of Shenzhou VI, China launched Chang 'e-1 satellite to the moon at a distance of 38,4401km from the Earth in 2007, which is the pride of China people. Use scientific notation and keep three significant figures to indicate that the distance from the earth to the moon is ().
A.3.84× 106 km
C.3.85× 106 km
3 It is known that -x3Y2N and 2x3my2 are similar terms, so the value of mn is ().
a6 b . 3 c . 1d . 9
4. The distance from the origin on the number axis to six points of unit length indicates that the number is ().
A. 6 B- 6 c. 6 or -6 D is uncertain.
5, the following two items are similar in each group is ()
A, -m2n and mn2 B, 8zy2 and -y2z C, -m2 and 3m D, 0.5a and 0.5B.
6. The correct way to remove the brackets is ()
a、a2-(a-B+c)= a2-a-B+c B、5+a-2(3a-5)=5+a-6a+ 10
c、3a-(3 a2–2a)= 3a-a2-a D、a3-[a2-(-b)]=a3-a2+b
7, in the following four formulas, is the equation is ().
a . x = 1 b . 2x 3 c . 1+2+3+4 = 10d . | 1 0。 5|= 0.
8. The solution of equation x-3 = 2+3x is ().
A.-2; B.2c .-； D.
9, the following equation deformation error is ()
A. if x-3=y-3, then x-y = 0；; B if x- 1=3, then x = 4；;
C if x- 1=x, then x-1= 2xd; If 3x+4=2x, then 3x-2x=-4.
10, Xiaoming and Xiaogang walk in opposite directions from two places 25.2km apart. Xiao Ming walks 4 kilometers every hour, and they meet three hours later. Let Xiao Gang's speed be x km/h and the equation be ().
a、4+3x=25.2 B、3×4+x=25.2
c、3(4+x) =25.2 D、3(4-x) =25.2
II. Fill in the blanks (2 points for each question, ***24 points):
The reciprocal of 1 1. -5 is, the absolute value of -9 is, and the reciprocal of -3 is;
12. If you walk 5 meters east, mark it as +5 meters, and then walk 8 meters west, mark it as;
13. One morning in Beijing, the temperature was -60℃, and it dropped by 20 degrees in the middle of the night. At this time, the temperature is;
14 sum of all integers whose absolute value is less than 2; 15, if, then.
16. Calculation:-1-1=; -2+2=
17, the coefficient of single item-is, and the degree is.
18. In the following categories, _ _ is a linear equation with one variable (fill in the serial number).
① ② ③ ④
19, the difference between 5 and x is twice that of x, and the equation of 1 is _ _ _ _ _ _ _.
20, equation deformation is, this kind of deformation is called _ _ _ _ _ _ _ _ _ _ _, according to _ _ _ _ _ _.
2 1. Using scientific notation, 13040000 should be recorded as. If three significant figures are retained, the approximate value is.
22. Specify graphic representation operation A–B+C, graphic representation operation. Then+= _ _ _ _ _ _ _ _ (write the answer directly).
Three, the answer (23-27 questions each 4 points, 28 questions 10 points, 29 questions 12 points, ***46 points) must give the necessary calculus process or reasoning steps.
Display the following numbers on the number axis and connect them with ">".
3 ,―4,―2 ,0,― 1, 1
24、2x+8=x-3 25、
26、 ;
27. If |a-2|+ =0, then.
28, simplify the assessment:
29. A school awarded 3400 yuan scholarships to 25 students according to two kinds of awards, among which the first prize was 200 yuan for each student and the second prize was 120 yuan. How many students won the first prize?
30. At a maintenance station, Team A took a car and agreed to the East. From place A to work time, the travel record is (km):+15, -2, -5,-1,-10, -3, -2, -655438.
(1) When we call it a day, which side is Group A and how far is it?
(2) If the car consumes 0.3 liters per kilometer, how many liters does Group A consume when it is sent to work?
Congratulations on completing all the questions. Please check it carefully.