满足｛0,1,2｝真包含于A⊆｛0,1,2,3,4,5｝的集合A的个数是______个

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满足｛0,1,2｝真包含于A⊆｛0,1,2,3,4,5｝的集合A的个数是______个
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满足｛0,1,2｝真包含于A⊆｛0,1,2,3,4,5｝的集合A的个数是______个
满足｛0,1,2｝真包含于A⊆｛0,1,2,3,4,5｝的集合A的个数是______个

满足｛0,1,2｝真包含于A⊆｛0,1,2,3,4,5｝的集合A的个数是______个
满足｛0,1,2｝真包含于A⊆｛0,1,2,3,4,5｝的集合A的个数是__7____个
A中至少有0,1,2；
个数=2³-1=8-1=7个
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