If f (0.5) = 9, then f (8.5) is equal to () A. -9B. 9C. -3D. 0

∵ f (x-1) is an odd function, so f (- x-1) = - f (x-1), that is, f (- x) = - f (X-2). Also ∵ f (x) is an even function, it is obtained that f (x) = - f (X-2), f (x-4) = f (x) is constant for any x ∈ R, the minimum positive period of F (x) is 4, ∵ f (0.5) = f (8.5) = 9

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