1,2,-3,-4,5,6,-7,-8,9…… The number of 2014

-2014

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1. -1,2,-3,4,-5,6,-7,8,-9,10,… ,A,B,C,D,… (1) The 2014 number is -1,2,-3,4,-5,6,-7,8,-9,10,… ,A,B,C,D,… (1) Is the number 2014 a positive number or a negative number? Where is it in a, B, C, D? (2) Where are negative numbers in a, B, C, D?
2. A string of numbers by 1, 1, 2, 2, 3, 3, 4, 4, 5, 5 From the first number on the left, the 35th number is______ The sum of the first 36 numbers is______ ．
3. From the first number on the left, the 35th number is (), and the sum of the first 36 numbers is ()
4. A string of numbers, arranged by 1,1,2,2,3,3,4,4,5,5,. From the first number on the left, the 25th number is? What is the sum of their first 26 numbers?
5. A series of numbers are arranged by 1,1,2,2,3,3,4,4,5,5. From the first number on the left, the 83rd number is ()
6. A string of numbers arranged in this way: 1,2,3,2,3,4,3,4,5,4,5,6 From the first number on the left, count 50 numbers. What is the sum of these 50 numbers?
7. What is the sum of 2005 numbers?
8. Observe the following numbers: 1, - 2,4, - 8,16, - 32, ·· according to this rule, the number 2005 is () fast ~ etc
9. One eighth fill in the brackets with the appropriate number
10. 32.8 × () = 1.3 × (). Fill in the appropriate number in the brackets~
11. 2. What is the 100th number of 4, 6, 8 and 10 according to this rule
12. 2. - 4.6. - 8.10. - 12, 14, - 16 the 99th number is the 100th number
13. There is a column of numbers 1, - 1,2, - 2,3, - 3
14. There is a column of numbers: 3.6.9.12 ····· what is the number 200 in this column? What is the sum of the top 100 numbers?
15. 1 + 2-3-4 + 5 + 6-7-8 + 9 + 10-11-12. It is a continuous integer starting from 1. You can find the algebraic sum of 2008 numbers by taking two integers and two negatives in turn
16. 1 + 2-3-4 + 5 + 6-7-8 +. Take two positive and two negative integers from 1. What is the sum of the first 2006 numbers?
17. If 1 + 2-3 + 4-5 + 6-7 + 8-9 + , is the sum of the first 2000 numbers written down by taking two positive and two negative integers from 1 What is the sum of the first 2000 numbers? Why?
18. 1 + 2-3-4 + 5 + 6-7-8 + 9 + 10. It is a continuous integer starting from 1. Take two positive and two negative in turn. What is the sum of the first 2006 numbers in this series
19. Find the sum of 1, negative 2,. 3, negative 4,5, negative 6,7, negative 8.99 and negative 100
20. Find the sum of 1, negative 2,. 3, negative 4,5, negative 6,7, negative 8.99, negative 100 integers, and calculate the formula