2.内积的简单性质 V为欧氏空间,Va,B,y∈V,Vk∈R 1)(a, kB)=k(a,B),(ka, kB)=k(a, B) 2)(a,B+y)=(a,B)+(a,y) 推广:(a,∑G)=z(a,月) 3)(0,B)=010 ( ) 2 1) ( , ) ( , ), , ( , )         k k k k k = = 2) ( , ) ( , ) ( , )        + = + 推广： 1 1 ( , ) ( , ) s s i i i i     = =  = 3) (0, ) 0  = 2. 内积的简单性质 V为欧氏空间，        , , , V k R