Primary school mathematics defines "in the natural number, what can be divided by 2 is even, what cannot be divided by 2 is odd". Now it is stipulated that there are odd and even numbers in negative integers

Primary school mathematics defines "in the natural number, what can be divided by 2 is even, what cannot be divided by 2 is odd". Now it is stipulated that there are odd and even numbers in negative integers

In learning, with the growth of knowledge and the expansion of scope, many definitions can be expanded. For example, subtraction in primary school can only reduce large numbers by decimals. After learning negative numbers, decimals can also be reduced by large numbers. If you still have to say that it is not enough to reduce, you will be a bit conservative and complacent

Express (1) odd number: (2) three consecutive even numbers: (3) number divisible by six: (4) divided by three to two

1.2n+1
2.2n-2,2n,2n+2
3.6n
3.3n+2
N are all integers

a. B is a natural number, and 56a + 392b is a complete square number

56a + 392b = 56 × (a + 7b) = 4 × 14 × (a + 7b) a + 7b = 14T (t is the complete square), so a is a multiple of 7, a ≥ 7, B is a non-zero natural number, so B ≥ 1, so a + B ≥ 8. When t = 1, a = 7, B = 1, a + B = 8, so the minimum value of a + B is 8. Answer: the minimum value of a + B is 8