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danlinh110
1 năm trước
a) cho n là số tự nhiên lẻ. chứng minh n^3+1 ko là số chính phương b) cho 3 số dương a,b,c thoả mãn : 1/1+a +1/1+b +1/1+c =2. tìm GTLN của biểu thức P=abc GIÚP MIK VS
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