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mikulinki123
2 năm trước
Cho ∆ABC vuông tại A. Tia phân giác của góc B cắt AC tại D. Kẻ DE vuông góc với BC tại E. a) Chứng minh ∆ABD = ∆EBD b) Cho AB =6cm , BC = 10cm . Tính AC? c) Chứng minh BD ┴ AE.
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