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dinhducluong1810
2 năm trước
Cho hình tứ diện ABCD có tất cả các cạnh bằng a gọi M,N lần lượt là trung điểm của AC ,AD ,P là điểm trên cạnh AB sao cho AB=4AP . Diện tích S thiết diện của tứ diện ABCD bị cắt bởi MNP là?
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