2+4+6+8+.+1000+1002

2+4+6+8+.+1000+1002
=2*(1+2+3+.500+501)
=Summation formula of 2 * 1 / 2 * (501 + 1) * 501 arithmetic sequence
=501*502=51102
Method 2
S=2+4+6+8+.+1000+1002 （1）
S=1002+1000+.+4+2 （2）
Two formula addition
2S=（1002+2）*501
S=（1002+2）*501/2=501*502=51102

RELATED INFORMATIONS

1. 2+4+6+8+10+12+...+1000
2. What is 2 + 4 + 6 + 8 + 10.. + 1000
3. What formula is used in the simple calculation of 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 = 15?
4. 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 10.100 = how much, how to calculate with the formula
5. 1 / 8 + 1 / 7 =? 1 / 4 + 4 / 5 =? 1 / 6 + 1 / 4 =? If you want to make a formula, how can you teach me to calculate?
6. 7, 5, 6, 9, 4 =? 5, 2, 4, 1, 5 =? 8, 6, 2, 3, 2 =? 3 formulas, What I'm talking about is that the results of the three problems have to be calculated all the time. I'm talking about that the first problem is 7, and the second and third problems have to be calculated with the same numerical results
7. A simple method is used to calculate; 2008-2-4-6-8. - 98-1000
8. 2800-2-4-6-8. - 98-100 by simple method
9. How to calculate 2800-2-4-6-8. - 98-100 with a simple method in the fourth grade?
10. 1. A person deposits 1000 yuan in the bank now. If the annual interest rate of the deposit is 5% and the compound interest is calculated, how much money can he get back from the bank in three years?
11. Then 2 + 4 + 6 + 8 +. + 1000 = () Starting from 2, the sum of consecutive n even numbers is 2 + 4 = 6 = 2x3; 2 + 4 + 6 = 12 = 3x4; 2 + 4 + 6 + 8 = 20 = 4x5 Then the sum of N consecutive even numbers should be 2 + 4 + 6 + 8 +. = (). Then 2 + 4 + 6 + 8 +. + 1000 = ()
12. 2+4+6+8.1000 .. .
13. According to calculation, the thickness of 10000 sheets of paper is about 1 meter. Can you calculate the thickness of 1000 sheets of paper, 100 sheets of paper and 10 sheets of paper according to the thickness of 10000 sheets of paper?
14. (1 / 10 + 1 / 100 + 1 / 1000 + 1 / 10000) / (1 / 100 + 1 / 1000) simple calculation
15. Find the rule 0.175 1.8 0.35 0.9 0.7 0.45 () ()
16. 2, 0. 6, 1. 8 (), ()
17. Find the rules 1, 3, 8, 19, 32__ 19 * 2 + 4 = 32, think twice before you leap.
18. 1.9.8.14.15.19
19. Find the rule: 1.3.8.19,
20. 2.2.4.2.8.14.26.48.88 There should be an explanation