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Mathematics, 01.07.2021 14:00 usagimiller

Cho hình chóp SABCD, M thuộc là AC, N thuộc BC, K thuộc SA sao cho MC= 1/2 AC, N, K là trung điểm BC, SA. Xác định giao tuyến: a/(KMN) và (SAB)
b/(KMN) và (SBC)

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