We know that the function f (x) whose domain is r decreases monotonically on (- ∞, 5). For any real number T, f (5 + T) = f (5-T), then f (- 1), f (9), f (- 13) are of the same size

So the axis of symmetry x = 5
→x€(5,+∞),f(x)↑
Now just compare the abscissa with the axis of symmetry
→f(-13)>f(-1)>f(9)

RELATED INFORMATIONS

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