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1.Hai cạnh AB và BC của hình bình hành ABCD nằm trên hai đường thẳng x – y - 3 = 0 và 2x + y + 1 = 0, điểm P(-1; 0) là giao điểm hai đường chéo của hình bình hành. Viết phương trình các đường thẳng chứa cạnh CD và cạnh AD. 2.Các đường trung bình của tam giác ABC nằm trên các đường thẳng 5x – y + 4 = 0, x + y – 10 = 0, x – 5y – 4 = 0. Viết phương trình các đường thẳng chứa các cạnh của tam giác ABC.
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