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ntrumot01
2 năm trước
cho tam giác ABC vuông tại A trên cạnh BC lấy E sao cho BA=BE.tia phân giác của góc B cắt cạnh AC tại K. a.So sánh AK và KE b.chứng minh KE vuông góc BC. c.Chứng minh BK là đường trung trực của đoạn thẳng AE
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