Why can calculators work? Tell me from the perspective of digital electronics,

First, with BJT, then MOSFET, you can make up and, or, not these three basic circuits. Can you understand? Then you can make up addition and subtraction, then you have register, then you have buffer and latch, and then you can make up all of them

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1. 2. How many generations of digital computers have been developed?
2. 1234567+1234567=
3. 99999, 123456, 909876, 900098, 11111111, 1234567, 9876543, 234567890 English translation
4. How to pronounce 1234567 in music?
5. Add mathematical symbols bracket also calculate, 1234 = 8 12345 = 8 123456 = 8 1234567 = 8 12345678 = 8
6. How to compare two numbers
7. How to compare the size of two numbers?
8. How to compare two numbers?
9. Compare the size of two numbers √ (5 / 12) + √ (1 / 5) and √ (1 / 3) + √ (2 / 7)
10. How do you compare the two numbers? Which number is bigger, 2S / (V1 + V2) or s (V1 + V2) / 2v1v2?
11. When was the world's first electronic digital computer born
12. The main characteristics of electronic digital computer
13. How can 123456789 be equal to 555 If so, I can also know that each number can only be used once`
14. How does 123456789 calculate equal to 99
15. What does E-4 mean after the number in the calculator
16. Why is 2 + 5 equal to 7000000? It seems that there is one more Rix. How can it be eliminated?
17. Thank you
18. Use the substitution method to solve the following equations, do not give the answer directly （1） 3x + 4y = 16 ① 5x - 6y = 33 ② （2）4（x-y-1）= 3（1-y）- 2 ① x/2 + y/3 =2 ②
19. Multiplication of two numbers equals addition of two numbers What's the trick?
20. It is known that the value of square + 4x-2 of algebraic formula x is 3, 1. Find the square of the algebraic formula 2x + 8x-5 2. Find the value of the square of the algebraic expression - 3x - 12x - 1