Judge the odd and even numbers of the following functions: (1) f (x) = x (2) f (x) = 1 / 2 of the quadratic power of X (3) f (x) = - 3 + 1 (4) f (x) = - 3x's quadratic power + 2

Judge the odd and even numbers of the following functions: (1) f (x) = x (2) f (x) = 1 / 2 of the quadratic power of X (3) f (x) = - 3 + 1 (4) f (x) = - 3x's quadratic power + 2

The method and steps of judging odd function and even function: 1. The premise is that the domain is symmetrical about the origin. Otherwise, if the domain is not symmetrical about the origin, the function is neither odd nor even. 2. After judging the domain is symmetrical about the origin, see whether it meets the following formula: odd function: F (x) = - f (- x) even function