Mathematics, 22.07.2021 06:30 shyannehamilton1183
Bài 11: Cho tứ giác ABCD. Gọi M, N lần lượt là trung điểm của AC, BD. Gọi G là trọng tâm của tam giác BCD. Gọi I là trung điểm MN. Chứng minh: A, G, I thẳng hàng.
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Bài 11: Cho tứ giác ABCD. Gọi M, N lần lượt là trung điểm của AC, BD. Gọi G là trọng tâm của tam giá...
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