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dinhthugiangdt
2 năm trước
Cho tam giác ABC. Gọi A', B', C' lần lượt là trung điểm của các cạnh AB, BC, CA a) Chứng minh A'B'C' ∽ CAB b) Tính chu vi của A'B'C', biết chu vi của ABC bằng 54cm mọi người giúp e với . có hình vẽ thì càng tốt ạ
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