The sum of all prime numbers within 20 is () A .76 B .77 C .78
Prime numbers within 20 are: 2,3,5,7,11,13,17,19
So the sum of prime numbers within 20 is: 2 + 3 + 5 + 7 + 11 + 13 + 17 + 19 = 77
RELATED INFORMATIONS
- 1. What are the prime numbers within 20? What is the meaning of prime numbers?
- 2. What's the difference between prime numbers and prime numbers? So how to distinguish?
- 3. What is the difference between prime and prime?
- 4. Who knows how to find prime numbers
- 5. Is the 62nd power of 2 prime
- 6. a. B and C are three prime numbers within 100. How many different equations make a + B = C hold?
- 7. Given | 2a-1 | + | 3b-2 | = 0, find the value of a + B fast
- 8. Given 10 ^ a = 2, 10 ^ B = 3, find 100 ^ 2a-1 / 3B
- 9. There are three prime numbers whose product is 1001. What are the three prime numbers?
- 10. There are three prime numbers whose product is 1001. What are the three prime numbers?
- 11. Prime numbers within 20 Ah, different styles
- 12. Fill in the brackets with the appropriate prime number 20 = () + () 19 = () + () 35 = () × () 17 = () + () × () Fill in the brackets with the appropriate prime number 20 = () + () 19 = () + () 35 = () × () 17 = () + () × () Two exactly the same right angle trapezoid, can be put together into a (), can also be put together into a () Natural numbers greater than 0 are both primes and even numbers (); () are neither primes nor composite numbers.
- 13. Given that the quadrilateral ABCD is a rectangle, ab = 2, ad = 3, e is the moving point on the line BC, f is the midpoint of CD, and ∠ AEF is an obtuse angle, then the range of de length of the line segment is
- 14. In the quadrilateral ABCD, ∠ DAB = 60 °∠ DCB ° ad = AB, try to prove that the line CD BC AB can form a right triangle ∠DCB=30° ∠DCB=30°∠DCB=30°∠DCB=30°∠DCB=30°∠DCB=30°∠DCB=30°∠DCB=30°∠DCB=30°∠DCB=30°∠DCB=30°∠DCB=30°∠DCB=30°∠DCB=30°∠DCB=30°∠DCB=30°∠DCB=30°
- 15. Given that a, B and C are prime numbers, and a + B + C = 86, AB + BC + Ca = 971, find the value of ABC
- 16. AB is prime, and the molecule of a / 1 + B / 1 is 30. How many pairs of AB are there?
- 17. Given that AB is prime and 3a + 2B = 2000, find the value of a + B
- 18. What's the difference between the product of prime numbers within 10 plus the smallest two digits and subtracting the smallest two digits and subtracting the smallest three digits
- 19. The product of all prime numbers within 10 minus the largest two digits, the difference is______ .
- 20. The least common multiple of the three prime numbers is 42, and the three prime numbers are (), () and (). There is a reward for it