Mathematics, 10.11.2021 19:00 Matildagann
cho tam giác abcd gọi m và n lần lượt là trung điểm của các cạnh ab và cd chứng minh rằng vecto ac+ vecto bd =2vecto mn
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cho tam giác abcd gọi m và n lần lượt là trung điểm của các cạnh ab và cd chứng minh rằng vecto ac+...
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