This question is not difficult, but it requires higher clarity of thinking.

The monotonicity of (1)f(x) can be discussed in four cases: a/2 is less than or equal to-1, between-1 and 0, between 0 and 1, and greater than 1, and then the monotonicity of composite function can be used.

(2) Substitute f(x) and fo(x) at the same time, and then discuss it in four cases: a-ao and b-bo have the same sign, and the different sign is 2 * 2 =.

(3) There is something wrong with this question. How did a2 in the formula come out?

This is a programming problem (I don't know if it is a linear programming because there is something wrong with the topic). The area represented by "D is less than or equal to 1" is (-1, 0), (0, 1), (-65438.