这道题如何解---**Question:** 函数f(x) = log_{1/3}(-3x^2 + x + 5/4) (0 <= x <= 1/2) 的最大值为____. **Mathematical Formula:** f(x) = log_{1/3}(-3x^2 + x + 5/4) **Constraints/Interval:** 0 <= x <= 1/2 **Question Content:** Find the maximum value of the function f(x) = log_{1/3}(-3x^2 + x + 5/4) for 0 <= x <= 1/2.

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