已知函数. (1)求的单调区间和极值; (2)若方程有三个不等的实

已知函数.

1)求的单调区间和极值;

2)若方程有三个不等的实根,求实数的取值范围.

答案

解:(1)     

(2)由(1)知若

 

解得-27<a<5 所以a 的取值范围是(-27,5

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