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Mathematics, 02.07.2021 14:00 memorybuxton

Cho hình chóp SABCD có đáy hình thoi cạnh a. gốc ABC =60.cạnh bên SA vuông góc với đáy và gốc giữa hai mặt phẳng (SCD) và (ABCD) =60 . tính V hình chóp

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