摘要：9． 设.函数． (Ⅰ)若是函数的极值点.求的值, (Ⅱ)若函数.在处取得最大值.求的取值范围． 解:(Ⅰ)． 因为是函数的极值点.所以.即.因此． 经验证.当时.是函数的极值点．··············································· 4分 (Ⅱ)由题设.． 当在区间上的最大值为时. . 即． 故得．··············································································································· 9分 反之.当时.对任意. . 而.故在区间上的最大值为． 综上.的取值范围为． 12分

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