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n.t.thanhluong1359
2 năm trước
Cho tam giác ABC có AB < AC . Gọi D là trung điểm của BC. Trên tia đối của tia DA xác định điểm E sao cho DA = DE . Chứng minh: a) tg ADB = tgEDC b) AB // CE c) Vẽ tia phân giác Ax của tgBAC, đường thẳng đi qua điểm D vuông góc với Ax tại M, cắt tia AB tại I, cắt cạnh AC tại K. Kẻ BH song song với AC ( H IK ). Chứng minh : góc ABH=góc 2AKI
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