再根據(jù)函數(shù)的圖象關(guān)于直線x=1對稱,可得函數(shù)在(-∞,1]上是減函數(shù).
故離直線x=1越近的點(diǎn),函數(shù)值越小.
再由|1-
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可得 f(
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故選B.
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