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f 在 [0, 1] 连续， f(0) = 1, f(1) = 0 。存在 c 使 ？（答：是——对 用 TVI。）
f 在 [0, 1] 连续， f(0) = 1, f(1) = 0 。存在 c 使 ？（答：是——对 用 TVI。）
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