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Mathematics, 18.09.2021 14:00 aleanroverto723

Cho hình chóp S. ABCD có đáy ABCD là hình chữ nhật có AB = a, BC = 2a và SA = SC, SB = SD, mặt phẳng (SBC) tạo với mặt đáy một góc bằng 30◦
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S. ABCD bằng

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Cho hình chóp S. ABCD có đáy ABCD là hình chữ nhật có AB = a, BC = 2a và SA = SC, SB = SD, mặt phẳ...
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