Cho hình chóp $S.ABCD$ có đáy $ABCD$ là hình bình hành. Gọi M là trung điểm của $SA$ , trên đoạn $SD$ lấy $N$ sao cho $SN = 2ND$
a. Tìm giao điểm của $AB$ với mp $(CMN)$
c. CM: $SC // (MBD)$
Nhìn hình nhé

Câu a. Giao điểm cần tìm là $F$

Câu b. Vì $M;\ O$ trung điểm  $SA;\ AC$ nên $MO$ là đường trung bình trong $\Delta SAC$

Do đó $SC // MO \subset (MBD)$ Xong nhé


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