A natural number is either odd or even

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• 1. In natural numbers, it's either odd or even______ (judge right or wrong)
• 2. In natural numbers, it's either odd or even______ (judge right or wrong)
• 3. Is it right or wrong that there is no largest odd or even number in natural number
• 4. Non zero natural numbers are either odd or even, right
• 5. A non-zero natural number is either odd or even
• 6. In non-zero natural numbers, except odd numbers, they are even numbers
• 7. Three consecutive even numbers, the largest is m, then the smallest should be (). Their average is (). What is the unit of measurement?
• 8. The distance between a and B is 440 km. A bus and a truck leave from a and B at the same time. They meet in 4 hours. The bus runs 56 km per hour How many kilometers does the truck travel per hour? Lie equation
• 9. The speed ratio of a and B is known to be 3:4. A starts 15 minutes earlier than B. when a meets B, a walks 6 kilometers less than B. It takes 2.25 hours for B to start from B to meet A. how about the speed of a and B and the distance between a and B?
• 10. There are three cars, a, B and C, each driving at a certain speed from a to B. B starts 10 minutes later than C and catches up with C 40 minutes later; a starts 20 minutes later than B and catches up with C 1 hour and 40 minutes later?
• 11. In addition to odd numbers, there are also 0 and even numbers in natural numbers. Right or wrong
• 12. A natural number is either odd or even, right?
• 13. In addition to even numbers, natural numbers are odd numbers?
• 14. There are 20 natural numbers, of which the odd number is more than the even number, and the sum of them is 100. How many even numbers are there at least?
• 15. When a = (a is not equal to 0), the preceding natural number is (), and the following natural number is ()
• 16. If a is a natural number (a is not equal to 0), then the reciprocal of a is ()
• 17. If a is a natural number not equal to 0, and 540 / A is also a natural number, then a can take () natural numbers
• 18. M is a natural number which is not zero. What is the even number and what is the odd number
• 19. If the common factor of all even numbers is () a △ B = 10 (a, B is not equal to the natural number of 0), then the maximum of a, B is The common factor of all even numbers is () A △ B = 10 (natural number a and B are not equal to 0), then the greatest common factor of a and B is ()
• 20. What is the probability that the product of any two of the nine cards with numbers 1,2 ··· 9 is a complete square? What does it mean that the product of two numbers is a perfect square? Is a perfect square not the square of a certain number?