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一道高一数学的集合题目，

2025-04-06 06:00:38

推荐回答（1个）

回答1：

(1)a交b＝2＜x＜3，c：a＞0时，a＜x＜3a,a＞0时，3a＜x＜a.要使a交b包含于c，则a＞0，a＜＝2，3a＞＝3.得1＜＝a＜＝2. (2)Cia交Cib＝-4＜＝x＜＝-2,得a＜0.3a＜-4,a＞-2,得-2＜a＜-4/3

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