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lannphammvv
2 năm trước
Cho hình chóp S.ABCD biết ABCD là hình thang vuông ở A và D ;AB=2a,AD=DC=a. Tam giác SAD vuông ở S . Gọi I là trung điểm AD . Biết (SIC) và (SIB)cùng vuông góc với mp(ABCD). Tính khối chóp S.ABCD theo a
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