Mathematics, 23.07.2021 06:00, sleepingfrosty5611

Cho tam giác ABC , có AM là trung tuyến ứng với BC . Trên cạnh AB lấy điểm D và E sao cho AD=DE=EB . Đoạn CD cắt AM tại I . Chứng minh : a, EM song song với DC
b, I là trung điểm của AM
c, DC = 4DI

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Cho tam giác ABC , có AM là trung tuyến ứng với BC . Trên cạnh AB lấy điểm D và E sao cho AD=DE=EB ....