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namkp1
2 năm trước
Cho mk hỏi với ạ? Tìm gtln diện tích hcn có chiều dài = a, chiều rộng = b thì cạnh a + b = A diện tích = a.b thế sao dấu = xra lại là a = b vậy ạ? Ad t/c gì?
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