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Mathematics, 31.08.2021 14:00 brid695
Cho tam giác ABC cân tại A. Phân giác góc B và góc C cắt cạnh AC và AB lần lượt ở M và N. BM cắt CN ở I
a) Chứng minh BIC cân
b) BNC = CMB
c) AI là phân giác góc A
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Cho tam giác ABC cân tại A. Phân giác góc B và góc C cắt cạnh AC và AB lần lượt ở M và N. BM cắt CN...
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