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leminh243
2 năm trước
Cho tam giác ABC vuông tại A có AB < AC; phản giác BE . Lấy điểm H thuộc cạnh BC sao cho BH - BA a) Chứng minh . EH BC b) Chứng minh BE là đường trung trực của AH. c) Đuờng thắng EH cất đuởng thắng AB ở K. Chứng minh: EK - EC d) Chứng minh: AH / KC E) Gọi M là trung điểm của BK . F là trung điểm của CH . CMR : E , M ,F thẳng hàng
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