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meodixemay
2 năm trước
Cho tứ giác ABCD có O là giao của hai đường chéo AC và BD. Biết OA = OB; OC = OD. Chứng minh ABCD là hình thang cân. b) Cho hình thang cân ABCD (AB // CD) có O là giao của hai đường chéo AC và BD. Chứng minh rằng: OA = OB; OC = OD
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