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Trint739
2 năm trước
Cho góc xOy .Trên cạnh Ox lấy 2 điểm A và B.Trên cạnh Oy lấy 2 điểm C và D sao cho OA=OC,OB=OD. Nối BC và AD cắt nhau tại M. Nối AC và BD. a) cmr:MAC và MBD là tam giác cân b)gọi B và C là trung điểm của AC và BD .cmr: 3 điểm P,M,Q thẳng hàng Giúp mình vs mn ơi
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