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江苏省2019高考数学总复习优编增分练：高考解答题分项练（三）应用题.doc

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1(三)应用题1南半球某地区冰川的体积每年随时间而变化，现用 t 表示时间，以月为单位，年初为起点，根据历年的数据，冰川的体积(亿立方米)关于 t 的近似函数的关系式为V(t)Error!(1)该冰川的体积小于 100 亿立方米的时期称为衰退期以 i10，解得t8.又 00， f( )单调递增， 6 3所以当 时， 6f( )min f 2 .( 6)2 1232 3 3答 当 DCE 时， f( )取得最小值 2 千米 6 3

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