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dothanhduc27
2 năm trước
cho tứ diện abcd ,i là trung điểm ab , g là trọng tâm tam giác acd . gọi (p) là mặt phẳng đi qua i , g và song song với bc . khi đó giao tuyến của (p) và mp (bcd) là a. đường thẳng đi qua và song song với . b. đường thẳng . c. đường thẳng đi qua và song song với . d. đường thẳng đi qua và song song với .
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