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Mathematics, 24.09.2021 17:10 julialombardo53

Cho ΔABC cân tại A .Kẻ đường phân giác ∠B và ∠C lần lượt cắt AB và AC tại M và N. BM ∩ CN tại I: a) Chứng minh ΔIBC là tam giác cân
b) Chứng minh ΔNBC= ΔMCB
c) Chứng minh AI là tia phân giác

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Cho ΔABC cân tại A .Kẻ đường phân giác ∠B và ∠C lần lượt cắt AB và AC tại M và N. BM ∩ CN tại I: a...
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