Mathematics, 08.08.2021 16:40 pearlielb

Cho tam giác ABC vuông tại A, 1 đường thẳng d cắt 2 cạnh AB, AC theo thứ tự các điểm D và E. gọi I, J,K, H lần lượt là trung điểm của các đoạn thẳng DE, BE, BC, DC. CM: I, H,K, J là hình chữ nhật

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Cho tam giác ABC vuông tại A, 1 đường thẳng d cắt 2 cạnh AB, AC theo thứ tự các điểm D và E. gọi I,...

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