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Mathematics, 30.07.2021 14:00 Geo777

Cho hình chóp SABC có đáy là tam giác ABC đều cạnh a hình chiếu của đỉnh s trên mặt phẳng ABC là trung điểm cạnh AB góc tạo bởi cạnh SC và mặt đáy bằng 30 độ thể tích khối chóp SABC bằng

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Cho hình chóp SABC có đáy là tam giác ABC đều cạnh a hình chiếu của đỉnh s trên mặt phẳng ABC là tru...
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