a. B is two different prime numbers. If a + B = 20 and a * b = 51, what are the values of a and B?

17 and 3, very simple

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1. a. B is two different prime numbers. If a + B = 20, a * b = 51, then what are a and B respectively a. B is two different prime numbers. If a + B = 20, a * b = 51, then what are a and B respectively, the formula, method and idea should all be adopted,
2. The sum of two prime numbers is 20 and the product is 51. What's the difference between them
3. The prime number between 10 ` 20 has () where () digit is still a prime number after swapping position with digit on ten digit
4. Fill in the appropriate prime number in (). 10 = () + () = () + () 20 = () + () = () + ()
5. 10 = () + () = () + () fill in the appropriate prime number
6. 10 = () × (), fill in the appropriate prime number
7. Fill in the brackets with the appropriate prime number 20 = () + ()
8. What are the prime numbers within 20 What is prime
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12. Given that a, B, C are prime numbers and a + B + C = 86, ab = BC = AC = 971, find a, B, C I found that I had the wrong number. It should be ab + BC + AC = 971... I was wrong =. =
13. Let a, B, C be prime numbers, and a + B + C = 68, AB + BC + AC = 1121, find the value of ABC It's urgent. Please hurry up
14. If a, B and C are prime numbers, then is ab + BC + AB necessarily prime
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19. If a, B, C are all prime numbers, where a is the smallest, and a + B + C = 44, AB + 3 = C, then AB + C=______ ．
20. What is the difference between the product of all prime numbers within 10 minus the smallest three digits?