How to prove that the sum of the digits of two natural numbers must be greater than the sum of the digits of the number equal to the sum of two natural numbers?

There is a problem in the proof of mathematical induction! His proof is that the sum of the digits of 1 + 1 = 2 is equal to the sum of the natural digits. Then according to his theory, the two digits can be proved to be equal forever! In fact, it is very simple. If the addition of two natural numbers does not produce carry, it must be each number

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1. For a three digit number, the sum of the three digits is 17, the number in the hundred digit is 7 larger than that in the ten digit number, and two thirds of the number in the ten digit number
2. For a three digit number, the sum of the three digits is 17, the number on the hundred digit is 7 times larger than the number on the ten digit number, and the number on the one digit is 3 times of the number on the ten digit number
3. There is a four digit number, and the sum of its digits can be divided by 17. If you add 1 to the four digit number, the sum of its digits can also be divided by 17. The minimum number of the four digit number is 1______ ．
4. There is a four digit number, and the sum of the numbers on each bit of it can be divided by 17. If you add 1 to the four digit number, the sum of the numbers on each bit of the sum will be equal
5. What is the number of three hundreds and three ones
6. 3. How many different three digits can 5, 0 and 9 make up? Is there a formula for a problem like this?
7. How many 14 digit numbers can be made up of eight ones and six ones?
8. The sum of a two digit ten digit number and a single digit number is 7. If you add 45 to the two digit number, it will be the number formed by transposing the two digit number and the ten digit number. Then the two digit number is () A. 16B. 25C. 52D. 61
9. For a two digit number, the number on the one digit is 2 times more than the number on the ten digit number. If the number on the tens digit number and the number on the one digit number are exchanged, the new two digit number is 27 times larger than the original two digit number, and the original two digit number can be obtained
10. The sum of a two digit ten digit number and a single digit number is 8. The new number obtained by transposing the ten digit number and a single digit number is 2 times more than the original number. 10. Calculate the original two digit number Please use the linear equation of one variable
11. The sum of the reciprocal of two consecutive natural numbers is 17 / 72. What are the two numbers?
12. If a two digit natural number is equal to three times the sum of its ten digit and one digit, what is the two digit number______ ．
13. The sum of a two digit one digit number and a ten digit number is greater than 10. If 36 is added to the two digit number, it is exactly equal to the sum of the two digit numbers after exchanging the positions
14. A three digit number with a ten digit number of 0 is exactly 67 times the sum of the three digit numbers. After exchanging one digit with a hundred digit number, another three digit number is obtained. If the new three digit number is m times the sum of the three digit numbers, then M=______ ．
15. A ten digit is a three digit number of 0, which is exactly equal to 67 times of the sum of its numbers; after swapping its three digit numbers in the hundreds, we get a new three digit number, which is exactly the same Is the m times of the sum of the numbers that make it up. Find the value of M
16. How many different four digit numbers can be made up of 4, 0, 9 and 1
17. How many double digits can be made up of the ten digits of 0-9?
18. A three digit number, a ten digit number is equal to the sum of a single digit number and a hundred digit number, and the sum of you and the ten digit number is 9 The new three digits obtained by single digit exchange are 297 larger than the original three digits?
19. Given a two digit number, its ten digit number is 1 larger than the one digit number. If you exchange the number on the one digit number with the number on the ten digit number, the new number is 9 smaller than the original number. Find the number To process (2 yuan 1 time) detailed point thank s We all know that
20. Let's know that the sum of the number on the ten and the number on the single digit of a two digit number is 9. If we insert a '0' between the ten and the single digit, the three digit number obtained is six times of the original two digit number. What is the original two digit number? Quadratic equation of two variables! Complete process