?2.5 CramerE5
!μ
n
?íZ?F?￥Z?F
11 1 12 2 1 1
21 1 22 2 2 2
11 2 2
nn
nn
nn nnn
ax ax ax b
ax ax ax b
ax ax ax b
+ ++ =
+ ++ =
+ ++ =
null
null
nullnullnullnull
null
"
?￥
n
¨?

T
(5.1)
CramerE5
!L?Z?F￥"
?

T 0D ≠,5Z?Fμ·BBF
3
12
12
,,,
n
n
DD D
xx x
DD D
== =… (5.3)
11 12 1
21 22 2
12
n
n
nn n
aa a
aa a
D
aa a
=
null
null
nullnull null
null
?1NZ?F￥"
?

T,
?
k
D
^ü D￥? k
í
ísYD?è
[
12
,,,
n
bb b… 7¤?￥?

T,'
11 1 1 1 1 1 1
21 2 1 2 1 1 2
11 1
,
kkn
kkn
k
nnknnk n
aaba a
aaba a
D
aaba a
+
+
+
=
nullnull
nullnull
nullnull null null null nullnull
nullnull
? 1,2,,.kn= …
￡
ü
n5￡
ü (5.3)
^Z?F (5.2)
￥3,| (5.3)} ? (5.2)￥?B?Z?
V¤,
12
11 12 1
1
1
1
11
1
1
n
n
n
kk
k
nn
kjjk
kj
DD D
aa a
DD D
aD
D
abA
D
=
==
+++
=
=
∑
∑∑
null
1
11
1
11
1
1
1
1
1
1
.
nn
k jjk
jk
nn
j k jk
jk
n
jj
j
abA
D
baA
D
b
D
b
δ
==
==
=
=
=
=
=
∑∑
∑∑
∑
# (5.3)
@ (5.2)￥?B?Z?,] ? V
￡ (5.3)9
@ (5.2)￥ 
Z?,?
^ (5.3)
^ (5.2)￥3,
C￡
üZ?F￥3oμ (5.3),
!
11
,,
nn
xc xc= =…
^￥3,} ? V
¤
11 1 12 2 1 1
21 1 22 2 2 2
11 2 2
.
nn
nn
nn nnn
ac ac ac b
ac ac ac b
ac ac ac b
+ ++ =
+ ++ =
+ ++ =
null
null
nullnullnullnull
null
?
^,
] ? V¤,
22
,,.
nn
Dc D Dc D= =…#,
12
12
,,,.
n
n
DD D
cc c
DD D
== =…
è 5.1 3Z?F
20
321,
222
xy
xy z
xy z
+ =
+=
+?=
3Z?F￥"
?

T
21 0
3128,
21 2
D =?=
7 O,
3
210
311 10.
212
D =? =?
12
01 0 200
1126,312 4,
21 2 222
DD=?== =?
? CramerE5 V?Z?F￥31
314
,,.
425
xy z= =? =?