1, 11, 211211.111221, what's behind it

1 1
11 one by one
21 two one
1211 one two one
111221 one by one two by two one
312211 three one two two one one
13112221 one three one one two two one one

RELATED INFORMATIONS

1. Who knows the next line
2. 1.11.21.1211.111221 what is the law
3. Find the rule: 1,11,211211, ()
4. Find the rules: 1, 11, 21, 1211, 3112
5. 1,11,211211111221, what's the next number?
6. 1,11,211211111221, what's the next number?
7. What's the next number
8. Fill in the numbers according to the rules, and then write the eighth line: 1 11 21 1211 111221 312211 13112221
9. 1, 11, 2112111231131221, find the rule and fill in the number represented by "?" Friends, for your IQ to discuss it!
10. 9,3,1,1 / 9,1 / 27, fill in the number according to the rule
11. 9, 12, 21, 33, [], [] to find the law
12. 19.34.20.33.21.32
13. Find a different number from 8, 12, 16, 24, 28 and 30, and explain your division
14. Find a number that's different For example, 8 in 1 3 5 7 8 9 is a different number~
15. Piggy's room area is 60 square meters. How many such floor tiles do you need? (the upper bottom of trapezoid is 1 meter, the lower bottom is 3 meters, and the height is 2 meters)
16. How many bricks does a house that is 10 meters long, 3 meters wide and 2 meters high need Please write down the formula if possible
17. It is known that the density of bricks is 1.5 × 103 kg / m3. The walls of a house are built with bricks of 25 cm in length, 12 cm in width and 6 cm in thickness. If the total area of the internal and external walls of the house is 720 square meters and the thickness of the wall is 25 cm, the construction of the house will need bricks______ If the car can carry 4 tons at a time, it should be pulled at least______ It's only three times before you can pull these bricks
18. The first room is 8.3 meters long and 4 meters wide, and the second room is 5.3 meters long and 4 meters wide. It is planned that the floor tiles are 60 * 60. How many square meters are there in the house above me, or how many floor tiles do you want,
19. Half, two fifths, three tenths, four seventeen
20. Half, two fifths, three tenths, four seventeen, five twenty-six. What's the next number? The nth?