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Cho ∆MNP. E là trung điểm của NP. Lấy F thuộc ME sao cho E là trung điểm MF. a) CMR: ∆EMP=∆EFN b) Kẻ MS vuông góc với NP. Cho MP=5cm, MS=12cm, NS= 5cm. Tính chu vi ∆MNP. c) Lấy Q thuộc MS sao cho Sự là trung điểm của MQ, NF và PQ cắt nhau tại I. CM: NF=PQ
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