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antpdeptrai
2 năm trước
1) Cho tam giác nhọn ABC, đường cao AD,BE,CF cắt nhau tại H. Chứng minh a) tam giác HBF đồng dạng với tam giác HCE b) HB.HE=HF.HC=HA.HD c) EH là tia phân giác của góc DEF Mn giúp em với đi ạ. Em cảm ơn
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