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2018_2019学年高中数学第三章基本初等函数Ⅰ3.2.2对数函数情境导学素材新人教B版必修1.doc

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13.2.2 对数函数【情境导学】 某种细胞分裂时,由 1 个分裂成 2 个,由 2 个分裂成 4 个,由 4 个分裂成 8 个, 一直分裂下去,那么这样的一个细胞经过多少次分裂可以达到 100 000 个细胞?上面问题中的分裂次数 y 和细胞个数 x 之间用对数来表示为 y=log2x,那么这一函数有什么特殊的性质呢?提示:可类比指数函数的图象与性质进行学习.

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