设向量,若有常数a,b使 ,若有常数a,b使 ,若有常数a,b使
设向量,若有常数a,b使
设向量,若有常数a,b使,则( )
A.a=-1, b=-2
B.a=-1, b=2
C.a=1, b=-2
D.a=1, b=2
正确答案是A
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