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muivanmanh2
2 năm trước
Cho Tam giác ABC vuông tại A. Từ 1 điểm K bất kì thuộc cạnh BC vẽ KH vuông góc AC. Trên tia đối của tia HK lấy điểm I sao cho HI = HK . C/M : a.AB // HK b. AKI cân c. BAK = AIK
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