nguyensinhnam0908 nguyensinhnam0908
  • 18-02-2024
  • Mathematics
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Cho tam giác ABC nhọn, kẻ đường cao AI, từ I kẻ IM vuông góc với AB tại M, kẻ IN vuông góc với AC tại N. Chứng minh rằng: a, Tứ giác AMIN nội tiếp b, Tứ giác BMNC nội tiếp

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