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28
A
A
1
3
a
b
a
b
2
( )
27−31,
(
):
""
1. ""
;
2.
;
3. .
20 .
"B"
1. ;
2. K
(. 1).
20 .
K
.
1.
(.2a);
2. −
(.2b).
:
(.3).
:
.
""
"B"
29
■
""
,
2 : .
,
,
.
−""
.
"" .
■
""
.
,
.
■
.
■
"" (. 1) 2 ""
(. 2).
■
( 27 )
.
■ (
)
.
.
■
24
2 30 5
.
1 2.
(.1)
=
B =
C =
(. 2)
=
B =
C =
D =
■ , , ,
,
.
■
.
■
(. 6)
(
).
D =
E =
F =
E =
F =
G = M
1
A
B
C
D
E
F
A
B
C
D
G
E
F
2
F
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