How many even numbers are there in natural number 1 ~ 100, and how many odd numbers are there

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1. In the 100 natural numbers 1-100, the sum of all even numbers is more than the sum of all odd numbers______ ．
2. Add a plus or minus sign randomly between 1-2011 consecutive natural numbers (but the result should be positive), is the result odd or even? Be detailed!
3. How many even numbers are there in natural numbers 1 to 100? How many odd numbers are there?
4. Let n be a natural number, then the odd number can be expressed as (), and the even number can be expressed as (), (why)
5. How to express any natural number n, odd number, even number?
6. Use n to represent any natural number, then you can use () to represent even number and () to represent odd number
7. Let n be a natural number, then three consecutive odd numbers can be expressed as (), three consecutive even numbers can be expressed as (), and three consecutive integers can be expressed as () It's urgent. It will be handed in soon
8. Natural number is divided into odd number and even number according to (). It can also be divided into 1, prime number and composite number according to ()
9. In natural numbers less than 20, odd numbers containing prime numbers and composite numbers have; in natural numbers less than 20, even numbers containing prime numbers and composite numbers have
10. When x takes what value, 2x + 1 is negative even number? 3x-1 is positive odd number?
11. The product of three consecutive even numbers is 2688, the smallest of which is () The answer is now
12. The product of three consecutive even numbers is 480. What are the three even numbers?
13. The product of three consecutive even numbers is 26880, then the largest even number is?
14. The product of three consecutive even numbers is 2688. What is the smallest even number By the way, what are the three even numbers
15. The product of three consecutive even numbers is 960. What is the sum of these three numbers?
16. The sum of five consecutive even numbers is 380. What are the five even numbers To list
17. I'm smaller than 100 and bigger than 80. Am I even or a multiple of 3 or 5 Guess the number
18. The sum of three consecutive even numbers is 24. What are the three even numbers
19. The sum of three consecutive even numbers is 24. The three even numbers are (), (), ()
20. Given that the sum of three consecutive even numbers is 24, then the three numbers are______ ．