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kecuopmatrang
2 năm trước
Cho tam giác ABC vuông tại A, góc C =30°. Kẻ AH vuông góc với BC( H thuộc BC) a) So sánh AB và Ac, AH và HC b) Lấy điểm D thuộc tia đối của tia HA, sao cho HD=HA. Cm tam giác DHC =AHC c) tính số đo góc BDC Vẽ hình nx nhé
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