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Mathematics, 21.09.2021 03:50 savag3jitt

Cho tam giác ABC cân tại A, M là điểm bất kì ( M € AB ) lấy N thuộc tia đối CA ; CN=BM vẽ ME; NF lần lượt vuông góc với BC ; MN giao BC tại I a) Chứng minh IE=IF
b) Lấy D thuộc AC ; CD=CN. Chứng minh BMDC là hình thang cân

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