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证明: f(x) = ax^2 + bx + c 在 [p, q] 上的 TVM 是 a(p+q) + b 。(用直接公式。)
证明: f(x) = ax^2 + bx + c 在 [p, q] 上的 TVM 是 a(p+q) + b 。(用直接公式。)
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