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1111
zyxM a ),,(
2222
zyxM 1 bW
?
x
y
z
o
1
M
P
N
Q
R
2
M
21
== MMd
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21
NMM?
#°? PNM
1
?
P¨
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??
,
2
2
22
1
2
NMPNPMd ++=
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121
xxPM?=Q
,
12
yyPN?=
,
122
zzNM?=
2
2
22
1
NMPNPMd ++=∴
( ) ( ) ( ),
2
12
2
12
2
1221
zzyyxxMM?+?+?=
bW
?W ?
T
+
y1 ?
?sY1,),,( zyxM
)0,0,0(O
OMd =,
222
zyx ++=
x
y
z
o
1
M
P N
Q
R
2
M
~ ?yvD ?Dy
è p￡[ )1,3,4(
1
M a )2,1,7(
2
M a )3,2,5(
3
M
??1??￥ ???
^B??% ???,
3 =
2
21
MM,14)12()31()47(
222
=?+?+?
=
2
32
MM
,6)23()12()75(
222
=?+?+?
=
2
13
MM
,6)31()23()54(
222
=?+?+?
32
MM∴,
13
MM=
e2
? ?,
~ ?yvD ?Dy
è
! P xà
? )3,2,0(
1
P ￥ ?1
?? )1,1,0(
2
P ￥ ?￥
p? P￥US,
3
! P?US1 ),0,0,(xy1 P xà
=
1
PP
( )
2
2
2
32 ++x
,11
2
+= x
=
2
PP ( )
2
2
2
11 +?+x
,2
2
+= x
=
1
PPQ,2
2
PP
11
2
+∴ x 22
2
+= x
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~ ?yvD ?Dy
_
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_
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r
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r
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r
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r
bW°?US"? ?B? De?
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M
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r
r
r
=+
a
r
b
r
c
r
ü?
1H?E5
+
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a
r
k
b
r
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r
b
r
c
r
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r
rr
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s1]_Q_
b
r
a
r
c
r
|||||| bac
r
rr
=
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1H?E5μ
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r
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r
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r
r
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3
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r
rr
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r
r
r
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r
b
r
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r
b
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c
r
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ba
r
r
+
ba
r
r
a
r
b
r
~ ?yvD ?Dy
! λ
^B?
_
a
r
D λ￥e a
r
λ?1
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a
r
λ D a
r
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λλ =
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a
r
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a
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1
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rr
λμμλ = a
r
)(λμ=
s
￥
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rrr
μλμλ +=+ )(
baba
r
r
r
r
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.
0
ab
aba
r
r
r
r
r
λλ =
≠
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L
sA1Hq
^ i ·
￥
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A1?
a
r
kb
r
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a
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r
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r
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aa
rr
λλ = O a
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b
r
r
r
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=
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r
r
λ= ?
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r
r
μ=
TMh¤ 0)(
r
r
=? aμλ
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r
Q
# 0=?μλ
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V
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rrr
=
.
||
0
a
a
a
r
r
r
=
TV
ü B?d
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￥
￥2T
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|
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0
a
a
a
r
r
r
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5
3
2
1
5
ab
bba
r
r
rr
r
3?
+?+?
5
3
2
1
5
ab
bba
r
r
rr
r
ba
r
r
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5
1
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5
1)31(
.
2
5
2 ba
r
r
=
~ ?yvD ?Dy
è
k¨_
ZE￡
ü ?LoM
üs￥
1H?A
^
ü?
1H?,
￡
AM MC
=
BM MD
=
AD
=
AM
+
MD MC
=
+
BM BC
=
AD
D
ü? OM?,
BC
2
¤￡,
Q
∴
A
B
C
D
M
a
r
b
r
~ ?yvD ?Dy
bW°?US"
bW
?W ?
T
?i
D
ü
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a?K
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2
12
2
12
2
1221
zzyyxxMM?+?+?=
_
￥à
Q
_
￥FhE
_
D
￥eE
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￥ uY
ü?
1H?E5
?i
ea￥Z_
~ ?yvD ?Dy
± I5
1 a bW°?US"?·/
ò?
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2 aX?
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r
=
BD
b
r
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U
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1H?
1H
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,ba
r
r
,
~ ?yvD ?Dy
± I53s
1 aA: y; B: t; C:; D: ü;
BC AD
= =
AM
+
MD
).(
2
1
ba
r
r
+=
DC
=
AB =
AM
+
MB
).(
2
1
ba
r
r
=
A
B
C
D
M
a
r
b
r
2 a
~ ?yvD ?Dy
a/
ò?
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^
()
()
()
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a
a
a
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_________
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z
y
xzox
yoz
xoyp
B aA b5
5B
~ ?yvD ?Dy
3 a? )5,3,4(?A xoy
ü
￥
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zoxà
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5 aX? ???￥ ???? )4,1,2(?A )6,2,3(?B
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1V A?￥?Lé1 __________;
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2V ?￥B ?Lé1 @ @ @ @ @ @ @ @
3V C?￥?
Lé1 @ @ @ @ @ @ @ @ @ @ @
aX?
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1 @ @ @ @ @ @ @ @ @?? ￥USD 1 @ @ @ @ @
@ @ @ @ @ @
a ?°L
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=
s1 3?s5 A
? ￥US1 @ @ @ @ @ @ @ @ @ B
?
￥US1 @ @ @ @ @ @ @ @ @
= a yoz
pD ??X?? )2,1,3(A
)2,2,4(B )1,5,0(C ? ?￥?,
~ ?yvD ?Dy
°z A b
a _
^ @ @ @ @ @ @ @ @ @￥
a _
￥ @ @ @ @ @ @ @ @ @ @ @?S_
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a @ @ @ @ @ @ @ @ @ @ @ @ @￥_
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a
ü??]B°L￥BF_
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ü??]B
ü
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a
_
@ @ @ @ @ @ @ @ @ @ @á
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a
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aü bW?B M?ê_
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5=
~ ?yvD ?Dy
aü
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a1
P baba
r
r
r
r
=+ ? ?_
ba
r
r
,?
@ @ @ @ @ @ @ @
@ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @
a1
P baba
r
r
r
r
+=+ ? ?_
ba
r
r
,?
@ @ @ @ @ @ @ @
@ @ @ @ @ @ @ @ @ @ @
= a ¨_
ZE￡
ü ?LoM
üs￥
1H?
^
ü
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1H?,
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4321
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B a a y
t
ü
a
a
a ),,,( aaa? ),,(),,,(),,,( aaaaaaaaa
a
430
2
1
262
2
1
a
a
a
∑
=
=
4
1
4
1
i
i
xx
∑
=
=
4
1
4
1
i
i
yy
∑
=
=
4
1
4
1
i
i
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5Bs?
= a
~ ?yvD ?Dy
5=s?
B a a;μvl
?μZ_ avl
a
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L_
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a
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r
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r
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r
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1
(
1
acAD +?=
)
5
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).
5
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5
3
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43
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?
Bc
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x
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x
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o
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xoy
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t
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+
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),,( zyxM
x
y
z
o
)0,0,(xP
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USà
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US
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è 1
US bUSe?￥??￥Sà
òUòUS
1?
p?
3
21),,( cba
3
);,,(),,()1( cbaxOycba?
￥??
^1??
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cba
zOx
??
^
￥1?
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^1??
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cba
z
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à￥1?
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^?
~ ?yvD ?Dy
! ),,(
1111
zyxM a ),,(
2222
zyxM 1 bW
?
x
y
z
o
1
M
P
N
Q
R
2
M
21
== MMd
°?
21
NMM?
#°? PNM
1
?
P¨
"?
??
,
2
2
22
1
2
NMPNPMd ++=
= a bW
?W￥ ?
~ ?yvD ?Dy
,
121
xxPM?=Q
,
12
yyPN?=
,
122
zzNM?=
2
2
22
1
NMPNPMd ++=∴
( ) ( ) ( ),
2
12
2
12
2
1221
zzyyxxMM?+?+?=
bW
?W ?
T
+
y1 ?
?sY1,),,( zyxM
)0,0,0(O
OMd =,
222
zyx ++=
x
y
z
o
1
M
P N
Q
R
2
M
~ ?yvD ?Dy
è p￡[ )1,3,4(
1
M a )2,1,7(
2
M a )3,2,5(
3
M
??1??￥ ???
^B??% ???,
3 =
2
21
MM,14)12()31()47(
222
=?+?+?
=
2
32
MM
,6)23()12()75(
222
=?+?+?
=
2
13
MM
,6)31()23()54(
222
=?+?+?
32
MM∴,
13
MM=
e2
? ?,
~ ?yvD ?Dy
è
! P xà
? )3,2,0(
1
P ￥ ?1
?? )1,1,0(
2
P ￥ ?￥
p? P￥US,
3
! P?US1 ),0,0,(xy1 P xà
=
1
PP
( )
2
2
2
32 ++x
,11
2
+= x
=
2
PP ( )
2
2
2
11 +?+x
,2
2
+= x
=
1
PPQ,2
2
PP
11
2
+∴ x 22
2
+= x
,1±=? x
p?1 ).0,0,1(),0,0,1(?
~ ?yvD ?Dy
_
;μvl?μZ_￥
_
V
U
[
1
M 1 ?
2
M 1??￥μ_L
,
1
M
2
M
a
r
21
MM
é1 ￥_
21
MM
00
a
,_
é1 ￥_
0
r
||a
r
21
MM
| |
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￥
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￥vl
?ê_
? a_
￥à
Q
~ ?yvD ?Dy
1?_
? I
n ?ê?￥_
M?_
vlM? OZ_M]￥_
μ_
vlM??Z_MQ￥_
a
r
_?
a
r
b
r
a
r
a
r
bW°?US"? ?B? De?
?￥_
OM
M
~ ?yvD ?Dy
[1] FE cba
r
r
r
=+
a
r
b
r
c
r
ü?
1H?E5
+
y1 ?
a
r
k
b
r
a
r
b
r
c
r
|||||| bac
r
rr
+=
s1]_Q_
b
r
a
r
c
r
|||||| bac
r
rr
=
ü?
1H?E5μ
H9?1 ???E5
1 a_
￥FhE
~ ?yvD ?Dy
_
￥FE?/
p
?D
p
.abba
r
rr
r
+=+
2
p cbacba
r
r
rr
r
r
++=++ )().( cba
r
r
r
++=
3
.0)(
r
rr
=?+ aa
[2] hE
)( baba
r
r
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