Cho $A, B$ phân biệt. Tìm $m$ thỏa mãn các điều kiện sau: 

$a,\overrightarrow{MA}-\overrightarrow{MB}=\overrightarrow{BA}$ 

$b,\overrightarrow{MA}-\overrightarrow{MB}=\overrightarrow{AB}$

$c,\overrightarrow{MA}+\overrightarrow{MB}=\vec{0}$
con hai cai kia thi a la hien nhien dung, B thi M la trung diem. –  ♥♥♥ Panda Sơkiu Panda Mập ♥♥♥ 03-08-14 09:43 PM
cau b bi sai de nha. tu VT=> vec to BA = vec to AB => A trung B –  ♥♥♥ Panda Sơkiu Panda Mập ♥♥♥ 03-08-14 09:42 PM
tìm m nhỏ là tìm cái j –  dangtuan251097 03-08-14 09:37 PM

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