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?

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• 1. 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 ()
• 2. M is a natural number which is not zero. What is the even number and what is the odd number
• 3. If a is a natural number not equal to 0, and 540 / A is also a natural number, then a can take () natural numbers
• 4. If a is a natural number (a is not equal to 0), then the reciprocal of a is ()
• 5. When a = (a is not equal to 0), the preceding natural number is (), and the following natural number is ()
• 6. 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?
• 7. In addition to even numbers, natural numbers are odd numbers?
• 8. A natural number is either odd or even, right?
• 9. In addition to odd numbers, there are also 0 and even numbers in natural numbers. Right or wrong
• 10. A natural number is either odd or even
• 11. There are five digital cards. They are 1, 2, 4, 5 and 6. Take any two of them. The probability that the sum of the numbers of these two cards is even is?
• 12. From marked 1, 2, 3 If you take any two of the nine pieces of paper, the probability that the product of the numbers of the two pieces of paper is even is () A. 12B. 718C. 1318D. 1118
• 13. 21 is the smallest of several consecutive odd numbers, 32 is the largest of several even numbers. Nine odd and even numbers are known, and their sum is 241 How many odd and even numbers are there? Please make it clear, don't just give me numbers and equations, if so, please write the process.
• 14. Nine consecutive even numbers. The maximum number is three times the minimum number. What are the nine even numbers? Seven consecutive odd numbers are arranged from small to large. The sum of the second number and the sixth number is 38. What are the odd numbers
• 15. If nine consecutive even numbers are known, and the largest number is nine times the smallest number, then these nine numbers are zero___ ．
• 16. The sum of nine consecutive even numbers is 232 more than the smallest of them. What is the largest of these nine numbers?
• 17. The sum of nine consecutive even numbers is 232 more than the smallest of them. What is the largest of these nine numbers?
• 18. The sum of 9 consecutive even numbers is 232 more than the smallest of them. What's the largest number among these 9 numbers? It's 36. How can you give an example? Please answer the following question: 1、 The sum of 9 consecutive even numbers is 232 more than the smallest of them. What is the largest of these 9 numbers? 2、 A five digit number is divided by 72. I don't know the first and last two digits. The numbers on the thousand, hundred and ten digits are 6, 7 and 9 respectively. This five digit number is ()
• 19. The sum of nine consecutive even numbers is 232 more than the smallest of them. What is the largest of these nine numbers?
• 20. Nine consecutive even numbers, the largest number is three times the smallest number, find the nine consecutive even numbers are how many