1,2,5,13,34, () to find the law

The double of the last digit plus all the preceding digits equals the next digit

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1. Find the law 1,2,5,13,34, (), ()
2. The third number in the twentieth line -1 2 -3 4 -5 6 -7 8 -9 10 -11 12 -13 14 -15 16 Find the third number on the twentieth line
3. 1 / 3 + 1 / 6 + 1 / 10 + 1 / 15 + 1 / (1 + 2 + 3 + 4 + 5 +... N) =? Find the law
4. Rule finding
5. Find the rules 1,2,3,6,5,10, (), (), () Why, big brothers and sisters
6. Fill in the eight numbers of 10.20.30.40.50.60.70.80. In the small circle, so that the sum of the five numbers in each big circle is 210
7. Use 10, 20, 30 80 eight numbers, respectively fill in the small circle, so that the sum of five numbers on each big circle is equal to 210
8. 20% of 120 is 24 less than four fifths of a number. What's the number? Solve the equation
9. 1. Four fifths of a number is 24% more than 20% of 120. What is this number? The product of 2, 4.8 and 5 is 4 times less than 7 times of a number Please write the process
10. 20% of 120 is 24 less than 4 / 5 of a number. What's the number?
11. Find the law, the faster! Give more. 1,1,2,3,5 {} 13,21,34 {} 89
12. Find the law 1 1 2 3 5 α 13 21 34 β 89 α =? Find the law 1 1 2 3 5 α 13 21 34 β 89 α=?β=?
13. On a long enough note, write the natural numbers 1 to 500 from left to right, and then point a comma every three numbers from left to right, such as 123456789101112 The number before the 100th comma is
14. Write 1 ~ 1999 natural numbers from left to right on a long enough note, and then point a comma at each three digit number from left to right: as follows 123,456,789,101,112…… The number before the 100th comma is ()
15. Find the rule to fill in the number and solve the application problem~ 30 25 20 40 34 28 50 26 Find the rules and fill in the numbers Average problem: 198 natural numbers, 1,2,3 , 198 are divided into three groups averagely, and the average numbers of these three groups are equal. What is the sum of these three average numbers?
16. Help me to do a question, find the rules and fill in the numbers 2 13 5 6 4 11 5 7 7 4 10 7 11 1 12 I've been working all morning, but I can't do it
17. Two questions about filling in numbers regularly -3,-2,5,（）,61,122 6,7,19,33,71,（）
18. Find the law: 389114127912371623, 32______ ．
19. 3 / 89 1 / 14 12 / 79 12 / 37 16 / 23 3 / 2 () please find out the rule and fill in the number? Find out what the law is. It's six years of math,
20. Fill in the blanks according to the rules Two out of seven, three out of nine, four out of eleven 2 out of 1, 4 out of 4, 6 out of 9, 8 out of 16, [], [], 14 out of 49