Let f (x) = lx-1l + LX Al, if any x ∈ R, f (x) ≥ 2, find the value range of A

a> If | X-1 + A-X | = 3 or a = | X-1 + A-X |, and f (x) > = 2, that is | X-1 + A-X | > = 2, a > = 3 or a is obtained

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