• 2021-04-14
    已知与,单位向量平行于这两个向量的夹角的角平分线,且与y正向的夹角是钝角,则向量为( )。63ac4fcaad6cbb85274f80496a926116.png800bd7c349959b387917a39dffb63bdf.png193fdb43e5041151aaaef2881e81853f.png193fdb43e5041151aaaef2881e81853f.png193fdb43e5041151aaaef2881e81853f.png