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danghakhanhlinh1703
2 năm trước
Trong không gian Oxyz,cho mặt cầu (S)=x^2+y^2+z^2-2x-8y+9=0 và hai điểm A(5;10;0),B(4;2;1) Xét điểm M di động trên (S) GTNN của biểu thức MA+3MB là : A. 11√2/3 B. 22√2/3 C. 22√2 D. 11√2
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