Bài 1 : Trong mp Oxy, cho A(2;1) và B(3;4) , đt d có pt : 3x+y-27=0. Tìm toạ độ của điểm M trên d sao cho 
   $|\overrightarrow{MA}+\overrightarrow{MB}| $ nhỏ nhất
Bài 2 : Cho M(1;2) viết ptđt $\Delta $  đi qua M và tạo với 2 tia Õ,Oy 1 tam giác có diện tích nhỏ nhất ( $\Delta $ không đi qua O )

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