(1) If all x∈R, f(x)≧ 1 holds, find a set of values.

(2) Fixed point A(x 1, f(x 1)), b (x2, f (x2) (x 1

Note that the slope of straight line AB is k, which proves that x0 ∈ (x 1, x2) exists and f (x0)' = k remains unchanged.

(science) it is known that f (x) = e x-ax, where a≠0.

(1) If all x∈R, f(x)≧ 1 holds, find a set of values.

(2) Fixed point A(x 1, f(x 1)), b (x2, f (x2) (x 1

Remember that the slope of straight line AB is k, and ask whether x0 ∈ (x 1, x2) and f (x0)' > k hold. If yes, find the range of x0; if no, please explain the reason.