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buim12989
2 năm trước
Cho hình bình hành ABCD. Gọi M là 1 điểm thuộc AB; N là 1 điểm thuộc CD sao cho AM = CN. a) Chứng minh rằng : AMCN, BMDN là hình bình hành. b) Chứng minh rằng : AC, BD, MN đồng quy
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