1. Implementing the large-scale development of the western region is an important strategic decision of the CPC Central Committee facing the 2 1 century. The area of western China is 6400000 square kilometers, which can be expressed as square kilometers by scientific notation.
2. The following table shows the average temperature of several cities in China 1 month:
City Beijing Wuhan Guangzhou Harbin Nanjing
The average temperature is -4.6 degrees Celsius, 3.8 degrees Celsius 13. 1 Celsius-19.4 degrees Celsius, 2.4 degrees Celsius.
Arrange their average temperatures from high to low as follows:
3. An integer whose absolute value is greater than 1 and less than 4.
At 4.9: 45, the angle between the hour hand and the minute hand of the clock is.
5. As shown in the figure below, given the line segment AD= 16cm, the line segment AC = BD = 10 cm, and E and F are the midpoint of AB and CD respectively, the length of EF is.
6. If x=2 is the solution of the equation mx- 1=2, then m=.
7. As shown in the figure below, there are three channels A, B and C from point A to the nearest point B..
The channel is because.
8. Girls in a school account for 52% of all student unions, 80% more than boys. If the number of students in this school is X, then the equation can be listed.
9.。
10.
Second, choose one carefully (3 points for each question, *** 15 points)
Please fill in the code letters of the correct answer in the brackets after the question.
1 1. is the regular cube expansion diagram shown in the figure below on the left, which is ().
A B C D
12. There are four statements as follows: ① The complementary angle of an acute angle must be an obtuse angle; ② The complementary angle of an angle must be greater than this angle; (3) If two angles are complementary angles of the same angle, then they are equal; ④ Acute angle and obtuse angle complement each other. The correct one is ()
A.①② B. ①③ C. ①②③ D. ①②③④
13. If n is a positive integer, then the value of ().
A. It must be zero B. It must be even C. It must be odd D. It must be zero or even.
14. If A and B are reciprocal, and X and Y are reciprocal, the value of is ().
A.2 B. 3 C. 3.5 D. 4
15. The figure on the right reflects the percentage of seven continents in the total land area of the earth. A student draws the following four conclusions according to the picture on the right:
The largest of the seven continents is Asia;
② The sum of the areas of South America, North America and Africa.
About 50% of the total land area;
③ Africa accounts for about 20% of the total land area;
The area of South America is twice that of Oceania.
Which of the above four conclusions do you think is correct? ()
A.①② B. ①④ C. ①②④ D. ①②③④
Third, do it with your heart
16.(6 points)
17.(6 points) Solve the equation
18.(8 points) Please be the boss: Xiaoming's family has moved to a new house and wants to buy a new refrigerator. Xiao Ming and his mother took a fancy to two kinds of refrigerators in the mall. Among them, the price of refrigerator A is 2 100 yuan, and the daily power consumption is 1 kwh; Refrigerator B is a new energy-saving product, the price is 2220 yuan, and the power consumption is 0.5 degrees per day. The effect of the two refrigerators is the same. The boss said that refrigerator A can be discounted, but refrigerator B can't be discounted. Please calculate the price and explain that it is more economical to buy refrigerator A if it is at least discounted. (The service life of 0.5 yuan per kilowatt-hour is 10 year, with an average of 300 days per year).
19.( 10) Cartographic interpretation questions
( 1)as∠AOB = 90；
(2) draw a ray op arbitrarily in ∠AOB∞;
(3) Draw the bisector OM of ∠AOP and the bisector ON of ∠BOP;
(4) ∠MON= measure with a protractor.
Try to prove the correctness of your results by geometric methods.
20.(8 points) A shoe store sells a new type of women's shoes, and 46 pairs of women's shoes of this style were sold on 10. The following are the shoe sizes of the above 46 pairs of shoes recorded by the sales staff according to the sales order:
23.5,23.5,23, 23.5,24,23.5,22,24.5, 23.5,23.5,25,24,23.5,23,23,24.5,23,23.5,23.5,22.5,22.5,23.5,23.5,,23.5,23.5,24,23,22.5,24,23.5,23.5,25,22, 22.5,24,22.5,23,24,23,23,24,23,23,24,22, 24.5
(1) Can you try to sort out the above data more clearly?
(2) Please draw the sales histogram of various shoe sizes.
(3) How many pairs of women's shoes in sizes 23.5 and 24 were sold? What is the percentage of this kind of women's shoes in sales?
(4) Please put forward some reasonable suggestions on shoe store purchase.
2 1.(8 points) Arrange consecutive odd numbers 1, 3, 5, 7, 9… in the following table:
(1) What is the relationship between the average of five numbers in the cross box and 15?
(2) If you translate the cross box up, down, left and right, you can frame five other numbers. Can the sum of these five numbers be equal to 3 15? If yes, request these five numbers; If not, please explain why.
22.(9 points) The milk processing factory has 8 tons of fresh milk. If you sell fresh milk directly in the market (8 tons a day), you can make a profit of 500 yuan per ton; Made into yogurt for sale, you can make a profit per ton of fresh milk processed 1 200 yuan; When made into milk slices for sale, you can get a profit of 2000 yuan per ton of fresh milk. The production capacity of this factory is: if you make yogurt, you can process 3 tons of fresh milk every day; If you make milk slices, you can process fresh milk 1 ton every day; Due to the limitation of personnel and equipment, the two treatment methods cannot be carried out at the same time. Due to the limitation of temperature conditions, all milk must be sold or processed within 4 days.
Please help the milk processing factory to design a plan, so that all 8 tons of fresh milk can be sold or processed within 4 days, and you can get the maximum profit.