The first six items are 3,6,11,18,27,38, and the tenth item is

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• 1. Sequence: 3,6,11,18,27,38. What is the nth term
• 2. Find the sum of the first seven terms of sequence 2,6,18,54
• 3. Fill in the blanks after observing the rule of the following columns One half, two-thirds, three tenths, four tenths, five sixties_____ ,_____ ,_____ , Nth fraction______
• 4. Observe the law of the number in the following column and fill in the blanks: 0,3,8,15,24, what is the number 2004?
• 5. How can you turn all the women in the world into you n Grade 25 30100 Grade 26 32600 Grade 27 35200 Grade 28 37900 An=?A1=?
• 6. The most famous sequence in history
• 7. Finding the law of sequence 2,6,18,54,162. -1,3,15,51,159. -1.-3,-9,-27,-81... What is the relationship between the number of the second and third rows and the number of the first row?
• 8. Find the law from the sequence If the first cycle is 1, the second cycle is 4, the third cycle is 7, and so on, what is the number of N cycles? (it can be expressed by an algebraic expression containing n)
• 9. The problem of finding the law of sequence Let the sequence {1,4,9,16,25, x, y} satisfy a certain rule, y is not equal to 49, how many groups of solutions to ask x? Please list them all
• 10. There is such a series of numbers: A, B, a + B, a + 2B, 2A + 3b, 3A + 5b, 5A + 8b. A, B are constants. Can we write its general term formula an?
• 11. There are 100 natural numbers whose sum is even. Among these 100 natural numbers, the odd number is more than the even number. Q: how many even numbers are there at most?
• 12. In the even number series of 2, 4, 6.396 and 398, how many digits are there in total
• 13. There is a series of numbers, the first number is 8, the rule of each number is: if the previous number is odd, subtract 1 and multiply 2, if it is even, divide 2 and add 2 What is the 100th number?
• 14. There is an arithmetic sequence with even terms. The sum of odd and even terms is 24 and 30 respectively. If the last term exceeds 10.5 of the first term, try to find this sequence
• 15. How does Lucas sequence evolve from Fibonacci sequence and its practical application in daily life? Thank you
• 16. Fill in the brackets with 3, 6, 18 and 54, and each number can only be used once, () △ () × () = ()
• 17. 2, 6, 18, 54, 162, -- -- what do you want to fill in the next two numbers?
• 18. According to the law, fill in the appropriate number 54 / 5, 18 / 5, 6 / 5, 2 / 5 () in the brackets. Why
• 19. There is a column of numbers: 2, 5, 8, 11, 14, * * *. The seventh number is 20. What should the number 2008 be and what should the number n be It's a seventh grade math problem
• 20. Q: a column number - 2, - 5, - 8, - 11, - 14 What is the 100th number?