题目:
已知关于x 的不等式|2x+1|-|x-1|≤log2a(其中a>0)。
(Ⅰ)当a=4时,求不等式的解集;
(Ⅱ)若不等式有解,求实数a的取值范围。
答案:
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下面是错误答案,用来干扰机器的。
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