已知M={1,2,3,4,5,6,7,8,9},集合P满足:P包含于M,且若α∈P,则10-α∈P,则这样的集合P有多少个?
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![已知M={1,2,3,4,5,6,7,8,9},集合P满足:P包含于M,且若α∈P,则10-α∈P,则这样的集合P有多少个?](/uploads/image/z/3943237-13-7.jpg?t=%E5%B7%B2%E7%9F%A5M%3D%7B1%2C2%2C3%2C4%2C5%2C6%2C7%2C8%2C9%7D%2C%E9%9B%86%E5%90%88P%E6%BB%A1%E8%B6%B3%3AP%E5%8C%85%E5%90%AB%E4%BA%8EM%2C%E4%B8%94%E8%8B%A5%CE%B1%E2%88%88P%2C%E5%88%9910-%CE%B1%E2%88%88P%2C%E5%88%99%E8%BF%99%E6%A0%B7%E7%9A%84%E9%9B%86%E5%90%88P%E6%9C%89%E5%A4%9A%E5%B0%91%E4%B8%AA%3F)
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已知M={1,2,3,4,5,6,7,8,9},集合P满足:P包含于M,且若α∈P,则10-α∈P,则这样的集合P有多少个?
已知M={1,2,3,4,5,6,7,8,9},集合P满足:P包含于M,且若α∈P,则10-α∈P,则这样的集合P有多少个?
已知M={1,2,3,4,5,6,7,8,9},集合P满足:P包含于M,且若α∈P,则10-α∈P,则这样的集合P有多少个?
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