同济大学线性代数第六版答案(6)

bz ay by ax x by ax bx az z bx az bz ay y b bz ay by ax z by ax bx az y bx az bz ay x a +++++++++++++= bz ay y x by ax x z bx az z y b y by ax z x bx az y z bz ay x a +++++++=22 z y x y x z x z y b y x z x z y z y x a 33+= y

x z x z y z y x b y x z x z y z y x a 33

+= y

x z x z y z y x b a )(33+= (3)0)3()2()1()3()2()1()3()2()1()3()2()1(2

22222222

2222

222=++++++++++++d d d d c c c c b b b b a a a a ; 证明

2

22222222

2222

222)3()2()1()3()2()1()3()2()1()3()2()1(++++++++++++d d d d c c c c b b b b a a a a (c 4c 3 c 3c 2 c 2c 1得) 5232125232125232125232

122222++++++++++++=d d d d c c c c b b b b a a a

a (

c 4c 3

c 3c 2得)