1, No.2 in row 5 of the Olympic Stadium can be represented by (5,2), followed by (7,4). Fine soft hair or feathers.
The arithmetic square root of 2.8 1 is _ _ _ _, = _ _ _ _ _.
3. The positive integer solution of inequality -4x ≥- 12 is.
4. In order to make it meaningful, the value range of X is _ _ _ _ _ _ _ _.
5. In △ABC, it is known that both sides A = 3 and B = 4, so the value range of the third side C is _ _ _ _ _ _ _ _.
6. If one side of an isosceles triangle is equal to 5 and the other side is equal to 8, then the circumference is _ _ _ _ _ _ _.
7. As shown in the figure, please add a condition to make AD‖BC.
8. If the cube root of a number is itself, then the number is.
9. The coordinates of the point P (-2, 1) moving up by 2 units are.
10. Observe the following equation, =2, =3, =4. Please write a list containing n (n >); The equation of 2) represents the general formula of the above laws:.
Students, I am Fuwa Jingjing. What's the answer to Huanhuan's question? I'm in trouble. The teacher gave me some multiple-choice questions. I didn't meet the teacher's requirements, and I couldn't get the logo. It's all up to you (***20 yuan, two yuan for each question).
1 1. The Olympic Games need a polygonal tile to lay a seamless floor. The purchased tile shape cannot be ().
A, equilateral triangle; B, square; C, regular octagon; Regular hexagon
12, with the following statement:
(1) irrational number is an inexhaustible number; (2) Irrational numbers are infinitely cyclic decimals;
(3) Irrational numbers include positive irrational numbers, zero irrational numbers and negative irrational numbers; (4) Irrational numbers can be represented by points on the number axis. The correct statement is ()
A. 1
13, in,, 3. 14, 2+,-,0, 1.22666 …, the number of irrational numbers is ().
A.3 B. 4 C. 5 D.6
14. Known
a . a+5 & gt； b+5？ B.3a>。 3b； C.-5a >-5b？ d . >；
15. Let "●", ▲ "and ■" represent three different objects and weigh them twice with a balance, as shown in Figure 2. Then, these three objects are arranged as () in descending order of mass.
A.■●▲ B. ■▲● C. ▲●■ D. ▲■●
16, if the solution set of the inequality group is-1≤x≤3, the correct representation in the figure is ().
17, given that point M(3a-9, 1-a) is in the third quadrant, and its coordinates are all integers, then a= ().
A. 1
18, Beijing will hold an Olympic commemorative stamp exhibition. If each person has three stamps, there will be 24 more. If there are four stamps per person, there will be 26 less stamps. The number of stamps on display is: ()
a、 174 B、 178 C、 168 D、 164
19. In order to welcome the Olympic Games and protect the ecological environment, a county in our province responded to the national call of "returning farmland to forests" and changed part of cultivated land into forest land. After the change, the forestland area and cultivated land area * * * are 180 square kilometers, and the cultivated land area is 25% of the forestland area. In order to find out how many square kilometers the forestland area and cultivated land area are after the change. Let the changed cultivated land area be x square kilometers and the forestland area be y square kilometers. According to the meaning of the question, list the following four equations, of which the correct one is ().
A B C D
20. In an Olympic knowledge contest, there are 20 multiple-choice questions. The grading standard is: 1 5 points for the question, 2 points for the wrong 1 question, no points or points for not answering the question. Fuwa Jingjing has two unresolved issues. Answer at least a few questions correctly, and the total score will not be less than 60 points. Then Jingjing's at least correct number of questions is ().
A.7 Questions B.8, C.9 and D. 10
Third, Fuwa Beibei ran over and said to everyone, "Hurry up, the Olympic Committee is recruiting scorekeepers, scorekeepers. Let's go and have a look. " When they got there, it turned out that they were qualified. You must answer the following questions correctly. Can you do it? (**20 sheets, 5 sheets for each question)
(2 1)
(22) Solving inequality 2x- 1
(23)
(24).
Yingying brought a drawing of the Olympic venues. It is known that in △ABC, AD and AE are bisectors of the height and angle of △ABC respectively. If ∠ B = 30 and ∠ C = 50, can you help the master worker solve the following problems?
(1) Find the degree of ∠DAE. (5 pieces)
(2) What is the relationship between ∠ DAE and ∠C-∠B? (No proof required) (3 pieces)
26. Fuwa Yingying is going to buy a kitten and a puppy toy. Instead of telling Yingying the price of toys, the store gave her the following information to calculate the price of each kitten and puppy together with Yingying! (8 pieces)
A * * * to 70 yuan;
A * * * wants 50 yuan.
27.BOCOG will choose a company from A and B to print some Olympic commemorative books. A company puts forward that the design fee and processing fee are * * 1500 yuan, and each book is charged with material fee. 5 yuan: Company B proposed that each book should be charged with materials and processing fees ***8 yuan, but not design fees. The number of albums to be produced is X, which is charged by Company A..
(1) Please write down the relationship between the album number X, which represents the expenses of Company A; (3 pieces)
(2) Please write down the relationship between the album number X for making the commemorative album and the expenses (yuan) of Company B; (3 pieces)
(3) If you go to Company A and Company B to order commemorative books, which company do you think has the best price? Please write down the analysis reasons. (6 pieces)
Finally, five Fuwa took us to visit the "Bird's Nest" of the National Stadium. VIP tickets are 20% off for group tickets with more than 20 people (including 20 people) in 30 yuan. Our party has 18 people (including Fuwa). When the captain Huanhuan prepared change at the ticket office to buy 18 tickets, Jingjing, who loves thinking, stopped Huanhuan.
(1) Please calculate, is Jingjing's proposal correct? Is it really "wasteful"? (4 pieces)
(2) When the number of people is less than 20, how many people should go to the "Bird's Nest"? Is it more economical to buy 20 tickets? (8 pieces)
Dear classmate: How many badges have you collected? If you can collect more than 85 photos, you may receive Fuwa's signed photos. Work hard!