Its image can be divided into two categories: (1) when a> is in 1 to add functions; (2) when 0 < a <1is a decreasing function; Both images pass (0,1);
When a> is at 1, the bigger a is, the steeper the curve is; When 0
B. Logarithmic function: y = log-a-x, (a>0, a ≠1); A is the base, x is the real number and y is the logarithm.
Its image can also be divided into two categories: (1) when a> adds functions in 1; (2) When 0 < a< 1 is a decreasing function. Both images pass (1, 0)
When a> is in 1, the bigger a is, the higher the curve is; When 0
Compared with size, clever use of images is the best.