Cho tam giác ABC và 3 đường phân giác AM, BN, CP cắt nhau tại O. Ba canh AB, BC, CA tỉ lệ với 4, 7, 5 a. Tính MC, biết BC = 18cm b. Tính AC, biết NC - NA = 3cm c. Chứng minh: MB/MC . NC/NA . PA/PB = 1 d. Chứng minh: 1/AM + 1/BN+1/CP > 1/BC + 1/CA + 1/AB

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