Half, two fifths, three tenths, four seventeen, five twenty-six. What's the next number? The nth?

It's - 6 / 37
Nth (- 1) ^ (n-1) * n / (n ^ 2 + 1)

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1. Half, two fifths, three tenths, four seventeen
2. 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,
3. 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
4. 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
5. 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)
6. Find a number that's different For example, 8 in 1 3 5 7 8 9 is a different number~
7. Find a different number from 8, 12, 16, 24, 28 and 30, and explain your division
8. 19.34.20.33.21.32
9. 9, 12, 21, 33, [], [] to find the law
10. 1, 11, 211211.111221, what's behind it
11. Given 3, - 6,9, - 12... - 20042007 write the 100th number in this column? Find the sum of the number in this column?
12. Known 3, - 6,9,12 Complete the following questions: find the sum of this column?
13. 3, - 6,9, - 12 , - 2004, 2007, 2010, complete the following questions: (1) write the 100th number in this column; (2) Find the sum of this column
14. 3,-6,9,-12… -20042007, - 2010 to find the sum of this column
15. 3, - 6,9, - 12 ··, - 20042007, - 2010 the 100th number is? The sum of this column is?
16. The number of columns in the order of law is: - 1,3, - 5,7, - 9, 11. According to this rule, what is the 20th number in this column and what is the nth number What's the 20th book in this column
17. Write three fractions of equal size with nine numbers 1, 2, 3, 4, 5, 6, 7, 8 and 9. (each number can only be used once). For example: 36 = 714 = 2958
18. Use 9 numbers 123456789 to write three equal fractions. Each number can only be used once
19. 1 + 0 * 9 = 1,2 + 1 * 9 = 11,3 + 12 * 9 = 111 until 9 + 123456789 * 9 = 111111111 is there any rule
20. According to 123456789 * 9 = 1111111101, make the following formula answer 123456789*18=?123456789*36=?123456789*54=?123456789*72=? 123456789*27=?123456789*45=?123456789*63=?123456789*81=?