The form of exponential function is: y = a x, (a >；; 0，a≠ 1)

Domain: x∑(-∞, ∞),

Range: y = a x > 0.

Special values: a 0 = 1, a 1 = a, a (-1) =1/a.

The influence of the change of cardinal number a on the function value;

A> in 1, y = a x is increasing function, x >；; 0，y = a x > 1； X<0, then 0.

0<a< in 1, y = a x is a decreasing function, x >；; 0, then 0

Image: above the X axis, passing through points such as (0, 1), (1, a), (-1, 1/a);

A>0, the image rises monotonously; A<0, the image drops monotonously.

The form of power function is y-x n or y = kx n: (k constant).

N = 0, y = 1- constant function;

N = 1, y = x,-linear function;

N = 2, y = x 2, quadratic function;

N=- 1, y= 1/x (or y=k/x), inverse proportional function.

Its image and narration are too much trouble. Just name it, draw a picture on the draft paper and discuss its characteristics.