Ax/(x- 1), 9, Super invincible simple math problem (hope to have a detailed process)

1. The solution set of the known inequality ax divided by (x- 1) less than 1 is {x | x less than 1 or x greater than 2} to find a.

2. The solution set of the square of the inequality 3x -4x+k+ 1≤0 has only 1 elements to find r.

3. It is known that the solution set of inequality ax with square +bx+c less than 0 is the solution set of inequality ax with square -bx+c greater than 0 {X | X less than -2 or x greater than negative half}.