If there is a two digit number equal to 4 times the sum of the numbers, and the ten digit number is 2 less than the one digit number, then the two digit number is zero___ ．

If there is a two digit number equal to 4 times the sum of the numbers, and the ten digit number is 2 less than the one digit number, then the two digit number is zero___ ．

Let the ten digit number be x, then the one digit number be x + 2. According to the meaning of the question, we get 10x + X + 2 = 4 (x + X + 2), and the solution is x = 2. Answer: the two digit number is 24. So the answer is 24

The first power of 3 minus 1 is equal to 2, the second power of 3 minus 1 is equal to 8, and the third power of 3 minus 1 is equal to 26. According to this law, the number of 2008 power of 3 minus 1 can be obtained

The first power of 3 is 3, the second power is 9, the third power is 7, the fourth power is 1, and the fifth power is 3
1 2 3 4 5 6 7 ……
3 9 7 1 3 9 7 …… 3, 9, 7 and 1 cycles were added every 4 times
2008/4=0
So the number of times 2008 of 3 should be 1, and then subtract 1 to be 0

There is a three digit number whose number on the ten digit is equal to the sum of the number on the one digit and the number on the hundred digit
There is a 3-digit number whose 10 digits are equal to the sum of the number of individual digits and the number of hundred digits; the number of ten digits minus the number of individual digits is equal to 2; the 3-digit number obtained by the exchange of the number of hundred digits and the number of individual digits is 99 larger than the original 3-digit number. To solve this 3-digit number requires equations and calculation process

Let the numbers on the hundreds, tens, and individuals be a, B, and C respectively. From the condition, we know that a + C = B. B-C = 2. 100C + 10B + a - (100a + 10B + C) = 99, that is, C-A = 1. A = 2. B = 5. C = 3