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Mathematics, 24.07.2021 05:30 s2000damian
5. Cho tam giác ABC có ba góc nhọn. M là điểm thuộc cạnh BC. I, J lần lượt là hình chiếu
của M xuống hai cạnh AB, AC .M1, M2 lần lượt là điểm đối xứng của M qua AB, AC .
E, F lần lượt là giao điểm của M1M2 với AB, AC . Xác định M
a. Để IJ nhỏ nhất; lớn nhất .
b. Để tam giác MEF có chu vi nhỏ nhất
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5. Cho tam giác ABC có ba góc nhọn. M là điểm thuộc cạnh BC. I, J lần lượt là hình chiếu
của M xuốn...
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