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SaliAnna
2 năm trước
Cho hình bình hành ABCD có A = 120độ và AB = 2AD. a) Tính các góc của hình bình hành ABCD. b) Chứng minh rằng tia phân giác của góc D cắt cạnh AB tại điểm E là trung điểm của AB. c) Chứng minh AD vuông góc với AC.
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