It is known that the set a = {XL1 ≤ x ≤ 4}, f (x) = x2 + PX + Q and G (x) = x + 4 / X are functions defined on a, and at x0 they are all functions It is known that the set a = {XL1 ≤ x ≤ 4}, f (x) = x2 + PX + Q and G (x) = (x + 4) / X are functions defined on a, and the minimum value is obtained at x0, and f (x0) = g (x0), so the maximum value of F (x) on a can be obtained

G '(x) = 1-4 / (x ^ 2) g (1) = 5g (4) = 5g' (x) = 0, x = 2, G (2) = 4 is the minimum value, so x0 = 2, so f (x) takes the minimum value when x = 2, so f '(2) = 0f' (2) = 2 * 2 + P = 0P = - 4, because f (x0) = g (x0), f (x0) = 42 * 2-2 * 4 + q = 4q = 8F (x) = x ^ 2-4 * x + 8F (1) = 5F (4) = 8, the function is continuous and f '(2)

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