Mathematics
Mathematics, 29.07.2021 21:00, miguelc2145

cho tam giác cân ABC ( AB=AC) . Các tia phân giác của góc B, C cắt AB và AC tại E, F . Chứng minh BE=CF . Gọi I là giao điểm của BE và CF . Chứng minh AI là phân giác của góc A

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cho tam giác cân ABC ( AB=AC) . Các tia phân giác của góc B, C cắt AB và AC tại E, F . Chứng minh BE...

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