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If the function f (x) = x & # 178; - (A-1) x + 5 is an increasing function in the interval (1 / 2,1), the value range of F (2) can be obtained
The opening is upward and the axis of symmetry is x = (A-1) / 2
If it is an increasing function on the interval (1 / 2,1), then the symmetry axis needs to be on the left side of the interval, that is, (A-1) / 2
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