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trangle986
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cho tam giac ABC nhon ve phia ngoai cua tam giac cac hinh vuong ABDE tam M va ACFG tam N goi I,K la trung diem cua EG va BC
chung minh KMIN la hinh vuong
b) neu tam giac ABC co BC co dinh va do dai AH=h khong doi khi A di dong thi I se di dong tren duong co dinh nao
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chung minh KMIN la hinh vuong
b) neu tam giac ABC co BC co dinh va do dai AH=h khong doi khi A di dong thi I se di dong tren duong co dinh nao