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anhn66217
2 năm trước
Cho hình chóp S.ABCD có đáy ABCD là hình vuông cạnh a, SA vuông góc với mặt phẳng (ABCD) và SA=a3–√. Gọi M, N lần lượt là trung điểm của cạnh SB và SD; mặt phẳng (AMN) cắt SC tại I. Thể tích khối đa diện ABCDMNI là A. 53–√a3/18. B. 53–√a3/6. C. 133–√a3/36. D. 1.
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