Mathematics, 21.06.2021 01:00, lylessd423

Cho ∆ABC;phân giác AD, BE, CF cắt nhau tại I . a, Góc IAC+góc IBC+ góc ICA=? b, Kẻ IH vuông góc với BC . C/m Góc BIH=góc CID

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Cho ∆ABC;phân giác AD, BE, CF cắt nhau tại I . a, Góc IAC+góc IBC+ góc ICA=? b, Kẻ IH vuông góc với...