Toán Lớp 6: câu 25: khẳng định nào là sai ?
a.7 ∈ n b.7 ∈ z c.0 ∈ z d.-9 ∈ n
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Toán Lớp 6: câu 25: khẳng định nào là sai ?
a.7 ∈ n b.7 ∈ z c.0 ∈ z d.-9 ∈ n
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