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Câu 1. Trong mặt phẳng Oxy cho đường thẳng (d) :3x+y-3=0 và hai điểm A(2; 3), B(4; 1). a) Viết phương trình tham số của đường thẳng đi qua hai điểm AB. b) Viết phương trình tổng quát của đường thẳng f biết f đi qua A và vuông góc với (d) . c) Tính khoảng cách từ điểm B đến đường thẳng (d) .
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