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nguyenvietbinhduong8a7
2 năm trước
Cho tam giác ABC vuông tại A có AB=15 cm AC=20cm. Vẽ AH vuông góc với BC tại H.1,Chứng minh tam giác HBA và tam giác ABC đồng dạng. 2,Tính BC, AH. 3,Vẽ tia phân giác của góc BAH cắt BH tại D. Tính BH DH . 4, Trên cạnh HC lấy E sao cho HE =HA, qua E vẽ đường thẳng vuông góc với cạnh BC cắt AC tại M, qua C vẽ đường thẳng vuông góc với BC cắt tia phân giác của góc MEC tại F. Chứng minh H,M,F thẳng hàng Chỉ cần làm giúp mình câu 4
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