In 1,2,3,4,5,6 , 19992000, take 20 numbers out of the 2000 natural numbers, so that the sum of any two numbers can be equal Make these numbers satisfy that the sum of any two numbers is a multiple of 100

100、200、300、…… two thousand

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1. At 1, 2, 3 Of the 2000 natural numbers, there are______ Natural numbers can be divisible by 2 and 3 at the same time, and cannot be divisible by 5
2. From 1 to 100, there are () numbers, which may be multiples of 5 or 3
3. How much is the sum of all the multiples of 3 in the 100 numbers 1-100? What is the sum of the remaining numbers?
4. A math problem --- 1 ~ 100, what is the sum of all the multiples of three? There should be a formula
5. Find the rule and fill in the number according to the following formula 2/3-2/5=4/15 5/9-5/14=25/126 8/15-8/（）=8/15*8/（）
6. Observe the following formula and fill in the numbers regularly 1+2+1= 1+2+3+2+1= 1+2+3+4+3+2+1= First question, four square squares, fill in the number The second question, nine square squares, fill in the number The third question, 16 square squares, fill in the number
7. Find the law and write the formula Question 1: 48 divided by 6, 8 divided by 1, 56 divided by 7, 24 divided by 3 Question 2: 18 divided by 9, 18 divided by 6, 16 divided by 4, 35 divided by 7, then fill in 2 more The third question: 700 + 800, 1500 + 5003000-5009000-6000, then fill in two more I have an answer in mind, but I'm not sure,
8. Find the rule and fill in the formula, (1) 1 / 5 + 2 / 5 + 3 / 5 = 2 / 5 * 3 = 6 / 5 (1)1/5+2/5+3/5=2/5*3=6/5 (2)1/7+2/7+3/7+4/7+5/7=3/7*5=15/7 (3)1/7+2/7+3/7+4/7+5/7+6/7+7/7=4/7*( )=( ) (4)1/11+2/11+3/11+4/11+5/11+6/11+7/11+8/11+9/11=( )*( )=( )
9. Finding the least common multiple of 27 and 63
10. The greatest common divisor of 36 and 48 is______ The least common multiple is______ ．
11. The sum of all multiples of 3 in the 100 numbers 1-100 Please tell me how to find the number of items here
12. Find the sum of all the numbers except the multiples of 3 in the 100 numbers from 1 to 100
13. In the 100 natural numbers of 1, 2, 3,..., 100, how many different ways are there to take two different numbers so that their sum is a multiple of 7?
14. From 1, 2, 3, 4 The sum of any two natural numbers is a multiple of 100
15. Let the natural number 26 □ □ 08 be a multiple of 99
16. There's a string of numbers 1, 1, 2, 3, 5, 8, 13, 21, 34, 55 How many of the first 100 numbers are multiples of 5
17. Find the sum of all numbers from 1 to 100 that are multiples of 3 and multiples of 5
18. What is the sum of all the multiples of 3 in the 100 numbers 1-100?
19. 1,1,2,3,5,8,13,21,34,55,89,…… If 100 of the first n numbers are multiples of 3, then what is n at least? At most?
20. I'm a factor of 54, a multiple of 9, and I have two and three______ ．