,且

(1)求的最小值及對應的x值;

(2)若不等式的解集記為A,不等式的解集記為B,求

 

 

【答案】

20.(1) ∵

,∴

a = 2或a = 1(舍)····································································· 2分

又 ∵

       ∴ b = 2······························································· 4分

,

∴ 當時,的最小值為······························· 6分

(2) 由

,即······································· 9分

······································································· 11分

···································································· 12分

 

【解析】略

 

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