Do you know where mathematical coding is used in computers?

The characters in a computer are uniquely identified by a numeric code. The most popular character set is the American Standard Code set for information interchange, or ASCII code for short. It is specified by a 7-bit binary code

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1. What is the greatest common factor of 12 and 10______ The least common multiple is______ The greatest common factor of. 17 and 51 is______ The least common multiple is______ What is the greatest common factor of. 15 and 8______ The least common multiple is______ ．
2. Who can teach me how to press the math calculator in technical secondary school 2、 137.53 ≈ (accurate to 0.0001) 19 π / 3 π ≈ (accurate to 1) - 17 π / 8 ≈ (accurate to 1) sin (- 852 ° 17 ') ≈ (accurate to 0.0001) cos1604 ° 12' 33 '≈ (accurate to 0.0001) 6.28 ≈ (accurate to 1) 97.5 ° ≈ (accurate to 0.0001) Tan 796 ° 43' ≈ (accurate to 0.0001) arc Tan 0.3415 ≈ (accurate to 1)
3. What is the greatest common factor of 12 and 10______ The least common multiple is______ The greatest common factor of. 17 and 51 is______ The least common multiple is______ What is the greatest common factor of. 15 and 8______ The least common multiple is______ ．
4. On the counter, use 8 beads to dial the number, what is the maximum four digits? What is the minimum four digits?
5. Find the greatest common factor and the least common multiple. 17 and 34,..., 12 and 13,..., 42 and 49
6. How many different three digit numbers can be represented by five beads on the counter? What are the numbers?
7. Finding the least common multiple of 17 and 68
8. What are the maximum and minimum 2-digit numbers on the counter with 5 beads?
9. What is the least common multiple of 68 and 51
10. Primary school mathematics: dial the counter and write. What are the different numbers that can be represented by 5 beads? 6? 9?
11. What is the greatest common factor of 12 and 10______ The least common multiple is______ The greatest common factor of. 17 and 51 is______ The least common multiple is______ What is the greatest common factor of. 15 and 8______ The least common multiple is______ ．
12. What is the greatest common factor of 12 and 10______ The least common multiple is______ The greatest common factor of. 17 and 51 is______ The least common multiple is______ What is the greatest common factor of. 15 and 8______ The least common multiple is______ ．
13. How many of the first 120 square roots of natural numbers are rational numbers The position of the number a on the number axis is shown in the figure The square of a, Ba, C-A, the cube of Da chart A is on the left, 0 is in the middle, 1 is on the right
14. If the arithmetic square root and the cube root of a rational number are the same, then what is the number
15. What kind of number's arithmetic square root is the exact value if the arithmetic square root of a number is not a rational number
16. Write an irrational number respectively, so that the sum of the square roots of () and 11 is a rational number, and the product of the square roots of () and 11 is a rational number
17. Operation of real number |1-√2|*1/(1-√2)
18. Computing real numbers ① Root 3 plus 2 minus the absolute value of root 3 minus one-half of the square ② Negative root 36 plus root 2 and a quarter plus root 27 ③ Root 4 minus 2 divided by absolute value minus 2 times (minus 7 plus 5) ④ The absolute value of one-half square plus one minus the root sign three minus eight under the root sign Please write down the complete steps,
19. Operation order of real numbers
20. How to calculate the fifth root of a number with a calculator