What is the maximum number of one digit divided by one digit? ① 9, ② 8, ③ 7

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1. A four digit number, one digit number is 5, every three adjacent numbers add up to 10, what is the number
2. If 1 / a plus 1 / b equals 1 / 3, 1 / a plus 1 / B plus 1 / C equals 5 / 7, then what is C equal to?
3. If three points a (a, 2), B (5, 1), C (- 4, 2a) are on the same line, then the value of a is () A. 1 or 2B. 2 or 72C. 2 or − 72d. 1 or - 2
4. Let f (x) = x ^ 4-2x ^ 3 + 3x ^ 2-2x + 1 1. Find the remainder r of F (x) divided by the following formulas: (1) x + 1, (2) X-1, (3) x + 2, (4) X-2, (5) 2 (2) Respectively calculate: F (- 1), f (1), f (- 2), f (2), f (- 1 / 2)
5. A simple operation for finding 25-15
6. It is known that f (x) is a function defined on R. for any x belonging to R, f (x + 4) = f (x) + 2F (2), if the image of function f (x-1) is symmetric with respect to x = 1 And f (1) = 2, find f (2011) =?
7. Given x + 3Y = 2, find the value of x ^ 2 + 3xy-4x-6y + 7
8. Log function monotone interval LG (1 + X / 1-x) monotone interval urgent!
9. When two numbers with the same sign are added, take the sign of () and add (); when two numbers with different signs are added, take the absolute value () minus the smaller absolute value; () two numbers of () are added to get 0, and a number with 0 is still added to get ()
10. The monotone decreasing interval of the function y = LG [(x + 1) (3-x)] is?
11. How many 4-digit numbers are there when the remainder is 4 divided by 6.7.8.9
12. Divided by 7 or 6, the remainder is 1. What are the maximum four digits and the minimum four digits?
13. Divided by 7 or 6, the remainder is 1. What are the maximum and minimum four digits that meet this condition? Urgent! The teacher wants to use it! Please~
14. 1. Rounding a five digit number to ten thousand is about seventy thousand. What's the maximum and minimum of this number? 2. What's the number of nine digits that can be read out of all zeros with the nine digits of three thousand?
15. There is an 8-digit number, and rounding it to tens of millions is 50 million. What is the maximum and minimum of this number
16. A five digit number is about 100000 after rounding. What is the maximum and minimum of this number
17. There is a 7-digit number, and the number rounded to 10000 is 6.82 million. What is the minimum and the maximum of the 7-digit number? Is there any calculation method?
18. An eight digit number is composed of eight digits: 0, 1, 2, 3, 4, 5, 6 and 7. After rounding to ten million digits, it is about 70 million. What is the maximum and minimum of the eight digit number?
19. If a six digit number is rounded to 10000, it will be about 400000. The largest number is 10000______ The smallest is______ ．
20. If a six digit number is rounded to an approximate value of 150000, then the maximum of the five digits is {and the minimum is {