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21.09.2021 •
Mathematics
1. cho hình chóp tam giác đều S.ABC, có cạnh bên băng 2a; mặt bên hợp với đáy một góc 60 độ. Tính thể tích S.ABC? 2. cho hình chóp tứ giác đều S.ABCD, có cạnh bên bằng 2a; mặt bên hợp với đáy một góc 60 độ. Tính thể tích S.ABCD
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