集合A={x|-3≤x≤5},B={x|a+1≤x≤4a+1},且B包含于A,求实数a的取值范围?
人气：189 ℃ 时间：2020-04-19 01:09:19
解答
列三个不等式a+1>=-3即a>=-4;4a+1=0.三个解求交集得0
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