It is known that f (x) is a piecewise function: when x ≥ 0, f (x) = 1, X

It is known that f (x) is a piecewise function: when x ≥ 0, f (x) = 1, X

Let a = x + 2, bring in the inequality: a * f (a) + A-2 ≤ 5,
The results show that a [f (a) + 1] ≤ 7
According to the definition of piecewise function of F (x), we can see that:
When a ≥ 0, f (a) = 1, the formula 2A ≤ 7, 0 ≤ a ≤ 7 / 2
When a

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