The connection of junior high school mathematics and senior high school mathematics Solution inequality: (A-1) x2-ax + 1 > 0 The book discussed the idea and basis in the process 3Q!

The connection of junior high school mathematics and senior high school mathematics Solution inequality: (A-1) x2-ax + 1 > 0 The book discussed the idea and basis in the process 3Q!

(a-1)x²-ax+1>0
The cross multiplication is used to get [(A-1) X-1] (x-1) > 0
Because the coefficient of quadratic term is A-1
So we first consider (1) when A-1 = 0, that is, when a = 1, we can easily get X