10.已知A(1A(1A(1,2,3)3)3),B(0B(0B(0,1,2)2)2),C(−1C(-1C(−1,0,λ)\lambda )λ)若AB→//AC→\overrightarrow{AB}//\overrightarrow{AC}AB//AC,则λ\lambdaλ的值为((( )))