Mathematics, 23.07.2021 17:50 babyari18

Câu 14. Cho tam giác , các điểm D và E lần lượt thuộc các cạnh AB và AC . Chứng minh rằng nếu DE // BC thì AD/AB=AE/AC

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Câu 14. Cho tam giác , các điểm D và E lần lượt thuộc các cạnh AB và AC . Chứng minh rằng nếu DE //...

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