2. The average number of times the earth is struck by lightning every year is about 16000000, which is expressed as ▲ times by scientific notation.
3. The urban population of a city is 10000 people, and the urban green space area is10000 m2, so everyone has green space.
4. If ∠ = 34 30', the complementary angle of ∠ is ▲.
5. It is known that point C is on line AB, and AC=2BC. If AB=2cm, BC = ▲ cm.
6. If the monomials 2x2ym and -xny3 are similar terms, the value of m+n is ▲.
7. Point A represents a point on the number axis. Move point A to the right by 7 units, and then move it to the left by 4 units. The end point happens to be the origin, so the number represented by point A is ▲.
8. When x= ▲, the value of algebraic expression 4x-5 is equal to -7.
9. It is known that the number A is greater than the number B 1. If there is no number A, then the number B can be expressed as ▲.
10. If ∠1+∠ 2 = 90, ∠ 2+∠ 3 = 90, then ∠ L = ∠ 3. The reason is ▲.
1 1. A city held a dragon boat race on the Dragon Boat Festival, 15 teams * * 330 people participated. It is known that each team has one boat, and each boat has an equal number of people. Each boat has 1 person to drum, 1 person to steer, and the rest row at the same time. Every ship is ready.
12. As shown in the figure, draw 1 point on line segment AB to get 3 line segments; Draw two different points to get six line segments; Draw three different points and you can get 10 line segments; ..... According to this rule, draw 10 small similarities, and you can get ▲ lines.
Second, multiple-choice questions: this big question ***6 small questions, 3 points for each small question, *** 18 points. Of the four options given in each small question, only
One meets the requirements of the topic. Please use 2B pencil to paint the answers to multiple-choice questions on the answer sheet.
13. In the following formula, it is correct
A.B. C. D。
14. The positions of real numbers and b on the number axis are shown in Figure Xin, then the following formula holds.
A.+b & gt； 0b . & gt； -b c .+b & lt； 0d .-& lt； b
15. The number of straight lines that can be drawn after two of any three points * * * is
A. One or three articles B. Three articles C. Two articles D. One article
16. The figure on the right shows the top view of the geometry composed of the same small cubes and the digital table in the small squares.
The number of small cubes displayed at this position, then the main view of this geometry is
17. Xiaoming and Xiaoli were born in 1999 10. Their birthdays are not the same day, but they are both Wednesday, and Xiao Ming was born earlier than Xiao Li, and the sum of their birth dates is 22. So when is Xiaoli's birthday?
15， 16， 17， 18
18. Observe Table L to find out the rules. Table 2 is a part taken from table 1, where the values of b and c are respectively
Table 1 Table 2
1 2 3 4 ……
2 4 6 8 ……
3 6 9 12 ……
4 8 12 16 ……
…… …… …… …… ……
16
20 b
c 30
A.20，25，24 B.25，20，24 C
Three. Solution: This big question is *** 1 1, and the score is ***76. Write the problem-solving process in the corresponding position on the answer sheet. Write out the necessary calculation process, derivation steps or text description when solving. Sign the drawing with 2B pencil or black ink.
19. (There are two small questions in this question, each with 4 points and * * * 8 points).
Calculation: (1);
(2) .
20. (5 points for this question) Simplify before evaluating:
, among which,
2 1. (There are two small questions in this question, each with 4 points and * * * 8 points) Solve the equation:
( 1) ; (2) .
As shown in the figure, C and D divide the line segment AB into three parts: 2: 3: 4, and E is the midpoint of the line segment AB.
Ad = 6 cm。 Find: (1) the length of AB line: (2) the length of 2)DE line.
23. (6 points for this question) Known.
(1) When x is taken, y 1=y2?
(2) At what value of X, y 1 is 5 larger than 2y2?
24. If the solution of equation (x+6)=2 is the same as that of equation (x+3) =-x, the value of.
25. (score 7 points) As shown in the figure, ∠AOC and ∠BOC are adjacent complementary angles, OD,
OE is the bisector of ∠AOC and ∠BOC respectively.
(1) Write the complement angle of ∠AOE;
(2) If ∠ BOC = 62, find the value of ∠COD;
(3) What is the special positional relationship between ray OD and OE?
Why?
26. (7 points for this question) Observe the following bitmap and explore its laws.
It takes 5 points to place the 1 th "small room";
Counting, it takes ▲ points to put the second "cabin to give";
Count, it takes ▲ points to put the third "small room".
(1) How much does it cost to put the ninth such "small room"?
(2) Write down the total number of points needed to place the nth such "hut"
Algebraic expression.
(3)7 1 How many "small rooms" do you need?
27. (8 points for this question) Prepare two square pieces of paper with the same size.
(1) Take a prepared square piece of paper and cut one around it.
Square of the same size (pictured) is folded into a rectangular box without a lid.
The side length of the bottom of the rectangular box is 6cm and the volume is 108cm3, so the original
What is the side length of a square piece of paper?
(2) Take a square piece of paper, just enough to make wrapping paper and put it on the side of the cylindrical food can (excluding the interface). What is the volume of this food can? (result retention)
28. (8 points in this question) After investigation, vegetable farmers found that the unit price of a pollution-free vegetable can be increased by 20% after processing, but the weight can be reduced by 10%. At present, 30kg of unprocessed vegetables are sold more than unprocessed vegetables 12 yuan. What is the price of this vegetable before processing?
29. (8 points for this question) Practice and operation: In class, Miss Li and her classmates discussed issues related to the triangle area. As shown in the figure, it is known that point A and point B are on the same straight line, and point C 1 and point C2 are on the same side of the straight line.
(1) Draw C 1 m ⊥ AB after C1,with the vertical foot M, and C2N⊥AB after C2, with the vertical foot N;
(2) Compare the dimensions of C 1M and C2N with compasses;
(3) Is the area of triangle C 1AB equal to the area of triangle C2AB? Ask what?
(4) Connect C 1C2 and ask whether AB and C 1C2 are parallel. (Use a ruler and a triangle to draw parallel lines to check)
(5) Draw triangles C3AB and C4AB on the same side as points C 1 and C2, so that the areas of triangles C3AB and C4AB are equal to those of triangle C 1AB; According to the diagram above, are points C3 and C4 on the straight line C 1C2?
(6) When a vertex of a triangle moves on the straight line C 1C2, does the triangle area formed by it and points A and B change?