Give me some math problems to do! ! !
1. Calculation: 2+4+6+…+18+2 =. A.11b.1c.9d.12
3. A KFC restaurant, measured by the method of step measurement, is about 25 steps long and 2 steps wide. It is known that a step size is about 6 cm, so the area of this restaurant is about () square meters. A.5 b.3 c.18 d.18
4. A "liquid crystal" color TV set is priced at 8 yuan, and it will be promoted during the New Year's Day. The preferential condition is that it will be given to 1 yuan from 1 yuan, so this color TV set is equivalent to a discount.
5. Only three cakes can be put in a pan at a time, and each cake has two sides. It takes 1 minute to bake one side, and at least () A．1 minutes b.5 minutes c.4 minutes d.3 minutes
6. Nutritionists think that the nutritional intake of 42g milk is equivalent to that of 15g eggs. A.21b.42c.56c.84
7. The stall owner who sells "coconut juice" accidentally knocked over the coconut juice cans. If they are arranged according to the rules shown in the figure, and the top floor is one, they should also put () coconut juice cans. A.4b.8c.16d.17
9. If July 1st of a certain year is Monday, then July 25th of that year is () A.Tuesday B.Wednesday C.Thursday D.Friday
1. A shopping mall issued 1 sales vouchers at a time, including 1 first prize, 5 second prizes and 3 third prizes. The winning rate of this lottery ticket is ()
A.1% B.21% C.16% D.1%
2. Fill in the blanks (3 points for each question, ***3 points)
11. Fill in the blanks regularly: 1, 4, 7, 1,.
12. Xiaohong bought a coat in the mall, and the price was listed in 1 yuan, with a 2% discount. Xiaohong actually spent RMB.
13. A deck of 54 playing cards is dealt to A, B, C and D in turn. If the first card is dealt to A, the last card should be dealt. (Fill in one of A, B, C and D) < P > 14. Every 1 grams of milk contains 2.1 grams of protein, then 2 grams of milk contains grams of protein.
15. A classmate measured her pulse and it jumped 18 times in 15 seconds, so Xiaohong jumped about once a minute.
17. Xiao Ming has four shirts in blue, yellow and white, and two pairs of trousers in black and gray. If he wants to match one of these clothes, he may have a choice.
18. To package a rectangular commodity with a length of 1 cm, a width of 7 cm and a height of 4 cm, at least a square centimeter of wrapping paper is needed, excluding seams and overlapping parts.
19. Three tapes are packed into a cuboid, and * * * has a packaging method.
2. If Xiaowen draws four straight lines in a circle, the circle can be divided into parts at most.
III. Answer the question (***4 points)
21. Mom bought two bags of rice (35.4 yuan each) in the grocery store, as well as beef at 14.8 yuan, vegetables in 6.7 yuan and fish at 12.8 yuan. Would you please use your estimated knowledge to explain that mom brought 1 yuan enough?
22. Xiaoliang wants to help her mother do some housework on Sunday. The required time is as follows: (1) tidy her bedroom for 8 minutes; (2) mop the floor for 1 minutes; (3) clean the mop for 3 minutes; (4) Use an electric heater to heat the bath water for mother for 3 minutes. How does Xiaoliang arrange the time reasonably to make the time used shortest?
23. There are two tool factories under the Municipal Machinery Bureau: "First Tool Factory" and "Second Tool Factory" (hereinafter referred to as "First Tool" and "Second Tool"). The following are the profits of the two factories in the last four quarters (unit: 1, yuan). First quarter, second quarter, third quarter and fourth quarter One tool 2 17 16 155 Two tools 15 16 18 19 (1) Draw a statistical chart of broken lines according to the information in the above table. (2) What are the profits of the two factories last year? What is the average monthly profit of each factory (accurate to ten thousand yuan)?
24. Three stores promoted the same new brand of drinks, and introduced preferential policies respectively. Store A bought a large bottle and gave it to others for free. B stores will be given a 1% discount; Store C achieves a 2% discount in 3 yuan. Bottled drinks (12mL) are sold in 1 yuan, while canned drinks (2mL) are sold in 2 yuan. (1) Which store is more economical to buy a can of drinks? (2) Which store is cost-effective to buy a large bottle of drinks and a tin of drinks? (3) Which store is cost-effective to buy three large bottles of drinks and three cans of drinks?
25. The following table shows the contents of each ingredient in every 1g of food: (unit: gram) Food Name protein Fat Carbohydrate Beef 2.1 1.2 .1 Bean Products 44.8 21.8 12.7 Vegetables 2.6 .4 2. Flour 1.5 1.6 73 Xiaolin's lunch today is: braised beef 15g, home-cooked tofu 5g, fried vegetables 1g, steamed bread 55. Food Name protein Content Fat Content Carbohydrate Content Beef (15g) Vegetables (1g) Tofu (5g) Flour (5g) Total < P > 26. Nutritionists divide various foods into four categories, and the names of the four categories are given in the table below. Food Name: The daily intake of all kinds of foods required by 12-year-old children. Remarks: Class I milk, eggs, 42g milk or 15g eggs, about 2g milk per bag, about 8 second-class fish, meat, tofu, 21g fish or 18g meat or 36g tofu, a chicken leg, about 9g third-class vegetables, Fruit 9g vegetable or 6g fruit A plate of vegetables is about 45g of the fourth kind of rice, bread, sugar 44g rice or 24g bread or 16g sugar A bowl of rice is about 1g and a piece of bread is about 12g (1) If Xiaojun doesn't like vegetables, how much fruit can he eat in order to ensure the nutrition of the third kind of food? (2) If Xiaojun only chooses 18g tofu in the second kind of food, how many grams of fish does he need to choose? How many grams do you need if you choose meat?
27. The Weiqi board is a square with 19 vertical and horizontal lines. If black and white pieces are arranged according to the rules shown in the figure, how many black and white pieces do you need?
Respondent: Yao Junyu-Trainee Magician Level 3 1-24 16: 29
1.1. Calculation (-2x2) 3 =
2. According to the statistics of the fourth census, China's existing population is about 1.3 billion. It is expressed as
person
3. Calculate 48× .258 =
4. (x+1) (x+2) =
5. (4a+) 2 = 16a2+8a+
6. If it is a completely flat way, then m. Then the value of p is
8. Calculate 31 29' 35' '× 4 =
9. As shown in the figure, straight lines l1‖l2, ∠ 1 = 15, ∠ 2 = 14,
then ∠ α = <
the conclusion is
12. as shown in the figure, a‖b, ∠ 1 = 46, then ∠2= degree
13. as shown in the figure, AE‖BD, ∠1=3∠2, ∠. , then the relationship between A and B is () < P > A.A, B with the same number B.A, B with different number C. One of them is D． It is impossible to determine < P > 16. Three consecutive odd numbers. If the middle one is n, their product is () < P > A.6N3-6NB.4N3-N. The square difference formula can be used to calculate ()
A. (x+1) (1+x) B. (+b) (b-)
C. (-a+b) (a-b) D. (x2-y) (x+y2)
18. AD⊥BC, perpendicular to d, DE‖AB,
then the relationship between ∠B and ∠1 is ()
A. Equality B. Complementarity C. Complementarity D. Uncertainty
2. As shown in the figure, straight line AB and CD intersect at point O, OE ∠. Then the degree of ∠BOE is ()
A.3 B.6 C.9 D.45
21. If two parallel lines intersect with the third line, then a set of bisectors of the same side inner angle are mutually ()
A. Parallel B. Coincidence C. Vertical D. Then the number of angles
equal to ∠1 (excluding ∠1) in the figure is ()
a.2b.4c.5d.6
III. Solve the following questions (4 points for each question, ***24 points)
23. Calculation: 4x. Find the value of the algebraic expression (x+y) (x-y)+(x-y)-(x2-3xy)
25. Calculate
(1) 22× 1998 (2) 199.92
26. Calculate (a+3 7x+54
IV. (5 points for each question, ***1 points)
29. The starting price for taking a taxi in a certain city is 1 yuan (that is, you have to pay the fare in 1 yuan). After reaching or exceeding 5km, 1.2 yuan will be increased for every additional 1km (the part less than 1km is counted as 1km). Now someone takes this taxi from A to B.
1. Calculation (-2x2) 3 =
2. According to the statistics of the fourth population census, the existing population in China is about 1.3 billion, which is expressed as
people
3. Calculation is 48× .258 =
4. (x+1) (x+2). The value of m is
7. If the product of (x+P) and (x+2) does not contain the linear term of x, the value of p is
8. Calculate 31 29' 35'' × 4 =
9. As shown in the figure, the straight lines l1‖l2, ‖. The angle equal to ∠B in the graph is
11. Proposition: If ∠1=∠2, ∠2=∠3, then ∠1=∠3,
then the topic is,
the conclusion is < ***18 points)
14. The following calculation is correct: ()
A. (-A3) 4 = A12b.A3.A4 = A12c.3A.4A = 12ad. (A3) 2 = A9
15. If Ab3 <; , then the relationship between A and B is () < P > A.A, B with the same number B.A, B with different number C. One of them is D． It is impossible to determine < P > 16. Three consecutive odd numbers. If the middle one is n, their product is () < P > A.6N3-6NB.4N3-N. The square difference formula can be used to calculate ()
A. (x+1) (1+x) B. (+b) (b-)
C. (-a+b) (a-b) D. (x2-y) (x+y2)
18. AD⊥BC, perpendicular to d, DE‖AB,
then the relationship between ∠B and ∠1 is ()
A. Equality B. Complementarity C. Complementarity D. Uncertainty
2. As shown in the figure, straight line AB and CD intersect at point O, OE ∠. Then the degree of ∠BOE is ()
A.3 B.6 C.9 D.45
21. If two parallel lines intersect with the third line, then a set of bisectors of the same side inner angle are mutually ()
A. Parallel B. Coincidence C. Vertical D. Then the number of angles
equal to ∠1 (excluding ∠1) in the figure is ()
a.2b.4c.5d.6
III. Solve the following questions (4 points for each question, ***24 points)
23. Calculation: 4x.