(本题满分10分)设函数

,其中

.
(Ⅰ)当

时,求不等式

的解集;
(Ⅱ)若不等式

的解集为

,求
a的值.
解:(Ⅰ)当
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时,

可化为
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,由此可得
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或

;
故不等式

的解集为

或

;(4分)
(Ⅱ)由

得,

此不等式化为不等式组

或

即
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或

因为

,所以不等式组的解集为

,由题设可得

=

,故

.
(10分)
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