5、运算规律设B均是n维向量λ,为实数) (1)a+B=B交换律) (2)(a+B)+y=a+(船律) (3)a+O=a (4)a+(-a)=O (5)a-B=a(城迹) (6 la=a (7)(1)a=(ua)=(a) (8)(+)a=a+O (9)(a+B)=a+B 剔Aa=0→1=0,0r.a=0,or.x=0.mnd,a=05、运算规律 (1) + = + (交换律) (2) ( ) ( ) + + = + + (结合律) (3) + = O (4) + − = ( ) O (5) − = + − (减法) ( ) (设α,β,γ均是n维向量,λ,μ为实数) (6) 1 = (7) ( ) ( ) ( ) = = (8) ( ) + = + (9) ( ) + = + = O = 0 . . or O = . . 0. . or and O = =