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Volcanicclay2018
2 năm trước
Ai jup mik câu này vs Cho hình chóp sabc có sa=a và sa vuông góc vs đáy. Tam giác abc vuông cân có ab=bc=a, b' là trung điểm của sb, c' là chân đường cao từ a của tam giác sac. Chứng minh sc vuông góc vs (ab'c') và tính thể tích sab'c'
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