问题:
若
a
=(2,-3,1),
b
=(2,0,3),
c
=(0,2,2),则
a
•(
b
+
c
)=( )
A.4
B.15
C.7
D.3
若
=(2,-3,1),
=(2,0,3),
=(0,2,2),则
•(
+
)=( )
a |
b |
c |
a |
b |
c |
A.4 | B.15 | C.7 | D.3 |
参考答案: