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nganhue87
2 năm trước
Cho hình chóp SABCD có AB và CD không song song.Gọi M là điểm thuộc miền trong của tam giác SCD.Tìm giao tuyến của: a) mp(SBM) &(SCD) b)(SBM)&(SAC) c)(SCD)&(ABM)
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