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Một tứ diện đều cạnh a có một đỉnh trùng với đỉnh hình nón, ba đỉnh còn lại nằm trên đường tròn.. đáy của hình nón.[r]
Đề thi thử môn Toan trường THPT Tran Binh Trong - Khanh Hoa - 2019 - [blogtoanhoc.com]
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