已知函数. (1)当时,求的最大值和最小值; (2)求实数a的取值范围,使在

已知函数.

(1),的最大值和最小值;

(2)求实数a的取值范围,使在区间上是单调函数.

答案

(1)时,.

因为上单调递减,在上单调递增,

所以.

(2),

所以上单调递减,

上单调递增.

所以.

.

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