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loanpham1312
2 năm trước
Cho tam giác ABC cân góc A có A < 90 độ. Các đường trung trực của AB,Ac cắt nhau tại O a) Chứng minh rằng: AO là tia phân giác của góc A b) Qua B, kẻ đường thẳng vuông góc với AB< qua C kẻ đường thẳng vuông góc với AC chúng cắt nhau tại K. Chứng minh AK là tia phân giác của góc A. c) Vẽ BD vuông góc AC, CE vuông góc AB, BD cắt CE tại H. Chứng minh rằng A,O,K,H thẳng hàng
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