trong không gian Oxyz cho 2 điểm A(1;-1;2) ,B(1;1;2) và đường thẳng d: (x+1)/1 =y/1=(z-1)/1 . Biết điểm M(a;b;c) thuộc đường thẳng d sao cho tam giác MAB có diện tích nhỏ nhất .Khi đó giá trị T=a+2b+3c bằng ?

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