If n is an integer, use a formula containing N: even numbers can be expressed as______ The odd number can be expressed as______ .

If n is an integer, use a formula containing N: even numbers can be expressed as______ The odd number can be expressed as______ .

If n is an integer, please use the formula containing N: even number can be expressed as 2n, odd number can be expressed as 2n + 1. So the answer is: 2n, 2n + 1