向量选择题,求助1.已知向量OM=(1-1/3)向量OA+1/3向量OB,则向量AM=( )向量ABA.1/2 B.2 C.1/3 D.-1/32.已知向量a=(-1,-1),向量b=(1,1),则A.30° B.45° C.120° D.180°3.平行四边形ABCD中,向量AB=
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![向量选择题,求助1.已知向量OM=(1-1/3)向量OA+1/3向量OB,则向量AM=( )向量ABA.1/2 B.2 C.1/3 D.-1/32.已知向量a=(-1,-1),向量b=(1,1),则A.30° B.45° C.120° D.180°3.平行四边形ABCD中,向量AB=](/uploads/image/z/10128338-26-8.jpg?t=%E5%90%91%E9%87%8F%E9%80%89%E6%8B%A9%E9%A2%98%2C%E6%B1%82%E5%8A%A91.%E5%B7%B2%E7%9F%A5%E5%90%91%E9%87%8FOM%3D%EF%BC%881-1%2F3%EF%BC%89%E5%90%91%E9%87%8FOA%2B1%2F3%E5%90%91%E9%87%8FOB%2C%E5%88%99%E5%90%91%E9%87%8FAM%3D%EF%BC%88+%EF%BC%89%E5%90%91%E9%87%8FABA.1%2F2++++B.2++++C.1%2F3++++D.-1%2F32.%E5%B7%B2%E7%9F%A5%E5%90%91%E9%87%8Fa%3D%EF%BC%88-1%2C-1%EF%BC%89%2C%E5%90%91%E9%87%8Fb%3D%EF%BC%881%2C1%EF%BC%89%2C%E5%88%99A.30%C2%B0++++B.45%C2%B0+++C.120%C2%B0++++D.180%C2%B03.%E5%B9%B3%E8%A1%8C%E5%9B%9B%E8%BE%B9%E5%BD%A2ABCD%E4%B8%AD%2C%E5%90%91%E9%87%8FAB%3D)
向量选择题,求助1.已知向量OM=(1-1/3)向量OA+1/3向量OB,则向量AM=( )向量ABA.1/2 B.2 C.1/3 D.-1/32.已知向量a=(-1,-1),向量b=(1,1),则A.30° B.45° C.120° D.180°3.平行四边形ABCD中,向量AB=
向量选择题,求助
1.已知向量OM=(1-1/3)向量OA+1/3向量OB,则向量AM=( )向量AB
A.1/2 B.2 C.1/3 D.-1/3
2.已知向量a=(-1,-1),向量b=(1,1),则<向量a,向量b>
A.30° B.45° C.120° D.180°
3.平行四边形ABCD中,向量AB=向量a.向量AD=向量b,则向量AC-向量BD=( )
A.2向量a B.-2向量a C.2向量b D.-2向量b
4.已知点A(-2,0),B(1,5)和向量向量a=(X,2),且向量AB//向量a,则X=( )
A.5/3 B.6/5 C.3/5 D.5/6
5.在三角形ABC中,若EF为AB,AC的中点,则向量EC=( )
A.1/2(向量AC-向量AB) B.1/2(向量AB-向量AC)
C.1/2 向量AB-向量AC D.向量AC-1/2向量AB
6. 已知向量,向量a向量b不共线,且实数X,Y满足2X向量a-(Y-7)向量b=(3+Y)向量a+(5X+3)向量b,则X,Y分别为( )
A.1,-1 B.-1,1 C.1,1 D.-1,-1
向量选择题,求助1.已知向量OM=(1-1/3)向量OA+1/3向量OB,则向量AM=( )向量ABA.1/2 B.2 C.1/3 D.-1/32.已知向量a=(-1,-1),向量b=(1,1),则A.30° B.45° C.120° D.180°3.平行四边形ABCD中,向量AB=
Cdabca
1.C.
2. D.
3.A.
4.B.
5.D,
6.A.