There are seven numbers in a row. The average of them is 30. The average of the first three numbers is 28. The average of the last five numbers is 33

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• 1. There are seven numbers in a row. The average of them is 30. The average of the first three numbers is 28. The average of the last five numbers is 33
• 2. Fill in the numbers according to the rules: 1,5,11,19,29, (), 55,
• 3. 1 + 1.2 + 3.3 + 51 + 7.2 + 11.3 + 13 according to a certain rule, what is the 27th formula
• 4. There is a series of numbers 1, 4, 91, 625, 36... They are arranged in a certain order, then the number 1998 is different from the number 1999
• 5. The number of columns arranged according to a certain rule is 9, 16, 25, 36 What is the hundredth number
• 6. What's the rule of 1 * 2 * 3 * 4 + 1 = 24 + 1 = 5 * 5 2 * 3 * 4 * 5 + 1 = 120 + 1 = 11 * 11 3 * 4 * 5 * 6 + 1 = 360 + 1 = 19 * 19
• 7. There is a string of numbers 1, 7, 13, 19, 25 The 1000th number in this column is______ ．
• 8. 1+2+3+4+5…… +How much is 2009 + 2010? 1 + (- 2) + 3 + (- 4) + +2009 + (- 2010) = too simple for me to understand
• 9. Odd numbers add and subtract equal to 32 Among all odd numbers from 1 to 31, select 7 digits to add and subtract (the number can be reused), and the result is 32
• 10. Is the sum of 1 + 2 + 3 +. + 99 + 100 odd or even? Write the reason
• 11. 1、 3.05 2.91 2.75 3.51 2.89 2.83 2.79 2.94 1? 2. What do you find by analyzing the data? 2、 The weight of boys in a class is as follows. (unit: kg) 32 39 40 35 37 29 51 27 34 31 35 36 36 52 35 45 33 32 33 28 1. What are the median, average and mode of this set of data? What do you find? 2. If the weight is between 29 kg and 45 kg, how about the weight of boys in this class?
• 12. Compare the number of the following two groups. Which group has the largest average number? One: 51.52.53.54.100. Two: 5.10.15.20.. 200
• 13. There is a column of numbers, the first number is 103, the second number is 51, starting from the third number, each number is the average of the first two numbers, then the number of the 21st number is What is the integral part?
• 14. Connect 1.2.3... 30 and make it a 51 digit number. How much is it divided by 9? How much is it divided by 11?
• 15. The following matrix is composed of all odd numbers (1) What is the relationship between the sum of nine numbers in the parallelogram and the number in the middle? (2) If you make any parallelogram box similar to (1) in a number matrix, is there such a rule for the sum of these nine numbers; (3) Can the sum of the nine numbers be equal to 1998? 20051017? If yes, please write down the smallest one of the nine numbers. If not, please give the reason 1 3 5 7 9 11 13 15 17 19 21 23 25 27 29 31 33 35 37 39 41 43 45 47 49 51 53 55 57 59 61 63 65 67 69 71 73 75 77 79 81 83 85 87 89 Inside the parallelogram is: 23 25 27 39 41 43 55 57 59
• 16. As shown in the figure, the following matrix consists of 50 even numbers 2 4 6 8 10 12（14 16) 18 20 （22 24 ）26 28 30 ............... 92 94 96 98 100 (1) What is the relationship between the four numbers in the box? (2) If the sum of four numbers is 200, can we find the four numbers? (3) if the sum of four numbers is 2004, can we find the four numbers?
• 17. Arrange the even numbers 2,4,6 in the natural number into the number table on the right (1) Which row and column is 1992 in the number table? (2) Which row and column is 1918 in the number table? 2 4 6 8 16 14 12 10 18 20 22 24 32 30 28 26 34 36 38 38 40
• 18. Arrange the positive and even numbers into 5 columns according to the following table: Arrange the positive and even numbers into 5 columns according to the following table: First column second column third column fourth column fifth column The first line The second line 16 14 12 10 The third line 18 20 22 24 The fourth line 32 30 28 26 、、、、、、 According to the above rules, 2000 should be in -
• 19. Arrange the positive and even numbers into 5 columns according to the following table: Column 1 column 2 column 3 column 4 column 5 The first line The second line 16 14 12 10 The third line 18 20 22 24 The fourth line 32 30 28 26 …… … … … … … According to the rule in the table, even number 2010 should be ranked in row and column; To specific process, to write all the columns of the law of the number! Well, child, I appreciate your courage to challenge difficult problems, but your answer is wrong
• 20. According to the above rules, 2010 should be in () A. Line 250 column 4 B. line 250 column 5 C. line 252 column 4 d. line 251 column 5