∵
AC
AB =
1
3 ,∴
AC =
1
3
AB ,
∴
OC =
OA +
1
3 (
OB -
OA ) =
2
3
OA +
1
3
OB =
2
3 (4,1,3)+
1
3 (2,-5,1) = (
10
3 ,-1,
7
3 ) .
故选C.
∵
AC
AB =
1
3 ,∴
AC =
1
3
AB ,
∴
OC =
OA +
1
3 (
OB -
OA ) =
2
3
OA +
1
3
OB =
2
3 (4,1,3)+
1
3 (2,-5,1) = (
10
3 ,-1,
7
3 ) .
故选C.