Find the rules, 18, 9, 10, 5, 6, 3, (), (). What do you fill in the brackets? Find the rules, 18, 9, 10, 5, 6, 3, (), (). What do you fill in the brackets?

18 9 10 5 6 3 is 2 times. So we should fill in 2 and 1

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1. Fill in the blanks: 18,9, () 4.5 3.6
2. 486162,54, (), (), 25,5,10,30120, () () 25200 486,162,54,（）,（）,2 5,5,10,30,120,（）（）25200 Find the law
3. Fill in the figures according to the regulations （1）（）,2,3,6,5,10,7,（）；（2）40,20,（）,5； (3) 1,2,4,5,7,8,10,(),().
4. First find out the rules, then fill in the numbers （1）1,1.1,1.3,1.6,（ ),( ),3.1,( ）.
5. Fill in the numbers according to the regulations: 1 / 4, 4 / 9, (), 16 / 25, ()
6. Fill in 6.25 2.5 1 () () 0.064 In a hurry
7. To be flexible, a little bit difficult, but the calculation to calculate the point, as long as the choice and fill in the blanks, the teacher asked me to give a question in the class meeting to the students We have learned that the quadratic equation of one variable, one variable, one variable and one variable can be expressed
8. Set up equations or equations to solve application problems: both a and B robots are used to carry chemical raw materials. Type a robot carries 30kg more per hour than type B robot. It takes the same time for type a robot to carry 900kg and type B robot to carry 600kg. How much chemical raw materials do the two robots carry per hour?
9. In the acute triangle ABC, BC = 12, the area of triangle ABC is 12, the two moving points m and N slide on the sides AB and AC respectively, and Mn ‖ BC, take Mn as the side, make a square mpqn downward, let its length be x, and the area of the common part of square mpqn and triangle ABC is y (Y > 0) (1) Height ad on edge BC in triangle ABC=____ (2) When x=____ PQ just falls on the side BC (3) When PQ is outside the triangle ABC, the function of Y with respect to X is (indicate the value range of x)
10. 1. The side length of square ABCD is 16 √ 2, the diagonal lines AC and BD intersect at point O, through o as od1 ⊥ AB at D1, through D1 as D1D2 ⊥ BD at point D2, through D2 as d2d3 ⊥ AB at D3, and so on, where od1 + d2d3 + d4d5 + d6d7 = - cm 2. Place a triangle ruler on the rectangle ABCD with length √ 3 and width 1, and slide on the diagonal at its right angle vertex P. one side of the right angle always passes through point B, and the other side intersects with the extension line of DC at Q, (1) What is the size relationship between the line segment PQ and the line segment Pb when the point q is on the edge DC (2) When the point q is on the extension line of side DC, is the conclusion of (1) still valid (3) When point P slides on line AC, △ PBC becomes an isosceles triangle? If possible, point out all the positions of Q where △ PBC becomes an isosceles triangle. If not, explain why
11. 9、18、54、5、10、30、7、()、（）
12. 2、6、18、54、（）、（）
13. In order to know A2 = 6, A5 = 162 in the equal ratio sequence {an}, find the first n terms and Sn of the sequence {an}
14. It is known that the sequence {an} is an equal ratio sequence, A2 = 6, A5 = 162. (1) find the general term formula of the sequence {an}; (2) let Sn be the sum of the first n terms of the sequence {an}, and prove that Sn · SN + 2s2n + 1 ≤ 1
15. In the known equal ratio sequence {an}, A2 = 6, A5 = 162, find the first n terms and Sn of the sequence {an}
16. It is known that the sequence {an} is an equal ratio sequence, A2 = 6, A5 = 162 (1) find the general term formula of the sequence {an} (2) if the first term n and Sn of the sequence {an} are more than 50, find the minimum value of n
17. It is known that the sequence {an} is an equal ratio sequence, A2 = 6, A5 = 162, An = 2 * 3 ^ (n-1), if Sn = 242
18. General term formula of sequence 1 / 2,2 / 5,1 / 3,2 / 7
19. A general term formula sequence 2, - 6,18, - 54. A general term formula
20. What is the general term formula of sequence 1 / 2, - 1 / 2,5 / 18, - 7 / 54