Ai giúp mk câu này chi tiết vs cho mk công thức càng tốt ạ viết pt đường thẳng đi qua A và cách B một khoảng = d với: a/ A(-1;2),B(3;5),d=3 b/ A(-1;3),B(4;2),d=5 c/ A(5;1),B(2;-3),d=5 d/ A(3;0),B(0;4),d=4

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