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xuanquyen220120
2 năm trước
Câu 15: Cho tứ giác ABCD. Gọi M, N, P, Q lần lượt là trung điểm của các cạnh AB, CD, AD, BC. Chusnwsng minh vecto MP = vecto QN ; vecto MQ = vecto PN. Câu 18: Cho tứ giác ABCD. CMR nếu vecto AB = vecto DC thì vecto AD = vecto BC ( giúp mình 2 câu đơn giản mà chi tiết dễ hiểu nha ... nhanh ạ ^ ^)
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