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Mathematics, 08.08.2021 14:00 habah2062

Cho hình bình hành ABCD trên cạnh AB lấy điểm M trên cạnh CD lấy điểm N sao cho AM=CN a. Chứng minh DM=BN
b. Chứng minh tứ giác AMCN là hình bình hành
c. Chứng minh tứ giác BMDN là hình bình hành

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