What are the rules of the results of 2 * 22 * 22 222 * 222 2222 * 2222 22222 * 22222

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• 1. How to calculate 2 + 22 + 222 +. 2222?
• 2. [high school sequence] do you know that three consecutive terms can be used to find the general formula of the sequence In the stem of the question, I only said that this is a sequence of positive numbers, and I also gave a formula. The first question is to find a1a2a3, and the second question is to find the general term formula. I derived A1, A2, A3. Can I use a3-a2 = a2-a1 = D or A3 / A2 = A2 / A1 = q to find the general term formula? Or should I use the formula given by the stem of the question to prove it? Although I have made the correct answer in both methods. The question is a little long. No point. Who will answer, It is known that {an} is a sequence of positive numbers, and the median of the equal difference between an and 2 is equal to the median of the equal ratio between Sn and 2. I calculate A1 = 2, A2 = 6, A3 = 10, Then the second question can be directly explained as arithmetic sequence according to a3-a2 = a2-a1 = D? How to answer the questions in the exam? I feel too confused and want to close this question
• 3. 2+22+222+2222+…… +What is 2222?
• 4. 2 + 22 + 222 + 2222 + 22222 + -- + 2222, please use a simple method to calculate
• 5. 50-49+48-47+46-… +4-3 + 2-1, simple algorithm
• 6. Fill in the blanks in the first day of junior high school! 1×2=1／3×1×2×3,1×2+2×3=1／3×2×3×4,1×2+2×3+3×4+4×5 =1／3×4×5×6,... According to the above rule, please guess: 1 × 2 + 2 × 3 + 3 × 4 +... + n (n + 1) (n is an integer)=------------- Very urgent ah, help, the right answer plus 50 points ah, speed!
• 7. There is a column of numbers as follows: 4, 5, 9, 14, 23. What is the number 1999?
• 8. There is a column of numbers, 2, 5, 8, 11, 14 Then 104 is the () th number in this column A. 33B. 32C. 34D. 35
• 9. 1.1.2.3.5.8.13.21.34. According to the characteristics of this column, what are the two numbers after the 34th number in turn
• 10. There is a column of numbers as follows: 1,4 / 5,7 / 9,10 / 13,13 / 17,16 / 21. What is the 50th? What is the 100th?
• 11. The law of sequence 1,4,13,40121 ·
• 12. Sequence: 3, 4, 5, 7, 8, 9, 11, 12, 13, 15, 16, 17, 18, 19, 20 Is there a general term formula? If so, what is it? No 18. I have the wrong number. I'm sorry What is the value of the number 2013?
• 13. The first five terms of known sequence are 1 / 2, 5 / 4, 7 / 8, 17 / 16, 31 / 32, and its general formula is?
• 14. Find the general formula of the following sequence 1,0,1 / 3,0,1 / 5,0,1 / 7,0
• 15. “1,2,3,5,8,13,21,34,55,89,134……” This seems to be an interesting bepoche sequence in mathematics. The most important feature of this sequence is: --
• 16. "1、2、3、5、8、13、21、34、55、89、144… "This is an interesting Fibonacci series in mathematics. What is the biggest characteristic of this series?
• 17. “1,2,3,5,8,13,21,34,55,89,144…” This is an interesting Fibonacci series in mathematics What do you learn from it
• 18. Known Fibonacci sequence: 1,2,3,5,8,13,21,34,55. There are several even numbers in the first 2003 items of this sequence
• 19. 1、0、1、0、1、0、1、…… What is the general term formula of?
• 20. General formula of 0,1,0,2,0,3