Mathematics, 30.07.2021 07:00 mariehayes099

cho tứ giác ABCD .gọi M, N lần lượt là trung điểm các cạnh AD, BC. chứng minh rằng MN=AB MN=DC thì ABCD là hình bình hành

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cho tứ giác ABCD .gọi M, N lần lượt là trung điểm các cạnh AD, BC. chứng minh rằng MN=AB MN=DC thì A...

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