straight line

When b=0, odd function; K>0 increasing function, k

2. quadratic function y = ax 2+bx+c (a ≠ 0)

parabola

When b=0, even function; A>0, y minimum = (4ac-b 2)/4a, the left side of the axis decreases and the right side of the axis increases; A<0, y max = (4ac-b 2)/4a, the left side of the axis increases and the right side decreases.

3. Exponential function y = a x(a >；; 0 and a ≠ 1)

Through the fixed point (0, 1), a >；; 1 increases with time; 0<a< 1 time reduction

Field r, range (0, +∞)

4. logarithmic function y = logax(a >；; 0 and a ≠ 1)

Passing the fixed point (1, 0), a >；; 1 increases with time; 0<a< 1 time reduction

Domain (0, +∞), range r

5. power function y = x a

Pass through the fixed point in the first quadrant (1, 1)

A>0 times growth

A<0 time reduction

Things that are too fine are not easy to hit, so let's write these.