Find the rule: 1 / 2, 1 and 2 / 3, 2 and 3 / 4, (), 4 and 5 / 6, ()

1 / 2, 1 and 2 / 3, 2 and 3 / 4, (3 and 4 / 5), 4 and 5 / 6, (5 and 6 / 7)

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1. How much is it from 1 to 100?
2. What's 1 up to 100
3. From 1 to 100, what is the result?
4. How much is it to add from 1 to 100?
5. Observe the following numbers and find out the nth number according to the rule What are the reasons for 1 in 2, 3 in 4, 7 in 8 and 15 in 16
6. General term formula of a group of numbers The general formula of two groups of numbers is 3,8,15,24,35, two negative 2 / 3,4 / 15, negative 6 / 35,8 / 63, negative 10 / 99 ～
7. How much is the next? It's better to have a general formula! 32144680, the following numbers are required
8. 5 / 4, 29 / 9, 83 / 16, 180 / 25, 331 / 366 find the general formula of this group of numbers or tell the law of this group of numbers The last number is 331 / 36. If you are interested, I will give you a bonus
9. A formula for finding a group of number rules in high school mathematics
10. 1, 3, 7, 13
11. -The law of 1 2 - 3 4 - 5 6 is expressed by n
12. The law of 1 * 2 * 3 * 4 * 5 * 6 * ····· n
13. Find the rule: 1-1 -, 2-2,3-4,4-8,5-16 find the nth number
14. The following group of numbers are written according to a certain rule: - 1,2, - 3,4, - 5 ·······, then what is the nth number
15. 1, - 2,3, - 4?
16. From 11 × 2 = 12, 11-12 = 12; 12 × 3 = 16, 12-13 = 16; 13 × 4 = 112, 13-14 = 112 The conclusion is: 1n (n + 1)=______ Using this law, we can know that 11 × 2 + 12 × 3 + +1n(n+1)=______ ．
17. Summary rule: 1 / N (n + 1)=________ Using this law, we can calculate: half + one sixth + one twelfth + one twentieth + one thirtieth
18. (1 + 1) × 1 / 2 = 1, (1 + 1) × 2 / 2, (1 + 3) × 3 / 2, (1 + 4) × 4 / 2?
19. -1 * (1 / 2) = - 1 + (1 / 2), - (1 / 2) + (1 / 3) = - (1 / 2) + (1 / 3), - (1 / 3) * (1 / 4) = - (1 / 3) + (1 / 4) (1) Rule: () is expressed by a formula containing N, where n is a positive integer (2) Use the above rule to calculate: (- 1 * (1 / 2)) + (- (1 / 2) * (1 / 3)) + (- (1 / 3) * (1 / 4)) +. + (- (1 / 2012) * (1 / 2013)) ask for the answer!
20. What is the law of 1 + 2 = 3 and 4 + 3 + 2 + 1 + 1?