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Duy2311
2 năm trước
Cho góc xOy tia Oz là tia pg của góc xOy. Trên tia Oz lấy didemr H. Qua H kẻ dg thẳng vuông góc với Oz, cắt Ox tại A cắt Oy tại B a) CM ΔOHA = ΔOHB và H là trung điểm của AB b) Kẻ HE ⊥ OA trên cạnh Oy lấy điểm F sao cho OF = OE nối H với F CM HF ⊥ OB c) CM EF // AB
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