欧氏空间的性质: (1)(a,kB)=k(a,B) (2)(a,B+y)=(a,B)+(a,) (3)(k1,B)=∑k(a12B) (4)(a,∑kB)=∑k(a,月)1 1 1 1 (1) ( , ) ( , ) (2) ( , ) ( , ) ( , ) (3) ( , ) ( , ) (4) ( , ) ( , ) t t i i i i i i t t i i i i i i k k k k k k                    = = = = = + = + = =     欧氏空间的性质：