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题型:填空题 题类:常考题 难易度:普通
(Ⅰ)解不等式f(x)≤4;
(Ⅱ)当f(x)≤4时,|x+3|+|x+a|<x+6,求实数a的取值范围.
(Ⅰ)求P;
(Ⅱ)证明:当m,n∈P时,|mn+4|>2|m+n|.
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