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hainguyen2807vn
2 năm trước
1.Cho tam giác abc cân tại A. Từ B kẻ BH vuông góc với AC tại H và từ C kẻ CK vuông góc với AB tại K, 2 đường thẳng BH và CK giao nhau tại I. Chứng minh AI là phân giác của tam giác ABC. 2. Cho tam giác ABC vuông tại A. Dựng ở nửa mặt phẳng bờ BC, ko chứa A, tam giác vuông cân CDB tại D. C/m AD là phân giác góc BAC Help em với mọi người. Em đang cần gấp. Thanks mọi người
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