已知M={x∈R|x≥22},a=π,有下列四个式子:(1)a∈M;(2){a} 发布时间:2017-04-12 22:45 │ 来源:www.tikuol.com 题型:选择题 问题: 已知M={x∈R|x≥22},a=π,有下列四个式子:(1)a∈M;(2){a}⊊M;(3)a⊆M; (4){a}∩M=π,其中正确的是( )A.(1)(2)B.(1)(4)C.(2)(3)D.(1)(2)(4)
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