( :
210000
)
,
,
, 、 ,
.
“ ”
、
,
.
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,
.
1
,
( )
.
{
a
n
}
a
n
=
(
3
n
-2
)
2
n
(
n
∈
N
*
), {
a
n
}
n S
n
.
,
.
S
n
=1×2+4×2
2
+
…
+
(
3
n
-2
)
×2
n
,
2
S
n
=1×2
2
+4×2
3
+
…
+
(
3
n
-2
)
×
2
n
+1
,
-
S
n
=2+3
(
2
2
+2
3
+
…
+2
n
)
-
(
3
n
-2
)
2
n
+1
=2+3×
2
2
(
1-2
n
-1
)
1-2
-
(
3
n
-2
)
×2
n
+1
,
S
n
=
(
3
n
-5
)·
2
n
+1
+10.
,
: ,
S
n
+1
=4
a
n
+10
,
a
1
=2
,
a
n
n S
n
, ,
,
,
.
( 、 、 )
,
, ,
( )
.
2
( ),
.
1
{
a
n
}
n S
n
S
n
+1
=4
a
n
+10
(
n
∈
N
*
),
a
1
=2.
a
n
S
n
.
,
,
.
1
( ):
S
n
+1
=4
a
n
+
10
,
,
a
n
=
S
1
,
n
=1
S
n
-
S
n
-1
,
n
≥
{
2
.
S
n
+1
=
4
a
n
+10
,
S
n
+2
=4
a
n
+1
+10
,
a
n
+2
=
S
n
+2
-
S
n
+1
=4
a
n
+1
-4
a
n
(
n
∈
N
*
),
a
n
+2
=4
a
n
+1
-4
a
n
.
2
( ):
n
, ,
,
S
n
+1
=4
a
n
+10=4
(
S
n
-
S
n
-1
)
+10
,
S
n
+1
=4
S
n
-4
S
n
-1
+10
(
n
∈
N
*
,
n
≥
2
)
.
: , ,
,
,
.
,
,
3
: ,
a
n
+2
=4
a
n
+1
-4
a
n
,
,
,
a
n
+2
-2
a
n
+1
=2
(
a
n
+1
-2
a
n
)(
n
∈
N
*
), {
a
n
+1
-2
a
n
}
.
:
32
2019 6
3
( ):
,
0
,
.
a
1
+
a
2
=
S
2
=4
a
1
+
10
,
a
2
=16
,
a
2
-2
a
1
=12
≠
0
,
{
a
n
+1
-2
a
n
}
12
,
2
,
a
n
+1
-2
a
n
=6×2
n
=3
×2
n
+1
.
:
3
,
,
0
,
. 3
a
n
+1
-2
a
n
=3×2
n
+1
,
, ,
,
( ,
, )
: , ,
, , ,
,
,
( , ,
, )
4
:
,
a
n
+1
-2
a
n
=3
,
a
n
+1
+3=2
(
a
n
+3
),
,
.
, ,
2
n
+1
,
a
n
+
1
2
n
+
1
-
a
n
2
n
=
3
,
a
n
2
n
=
c
n
,
c
n
+1
-
c
n
=3
,
.
a
n
2
n
=
c
n
=3
n
-2
,
a
n
=
(
3
n
-2
)
2
n
(
n
∈
N
*
)
.
n
≥
2
,
S
n
=4
a
n
-1
+10=
(
3
n
-5
)
2
n
+1
+10
,
S
1
=
a
1
=2
,
S
n
=
(
3
n
-
5
)
2
n
+1
+10
(
n
∈
N
*
),
.
: , ,
,
, , ( )
,
4
, ,
2
n
+1
,
(
, )
4
: ,
a
n
+1
+
p
·
2
n
+1
=2
(
a
n
+
p
·
2
n
) ,
p
,
p
,
p
.
( ):
5
( , ): ,
a
n
( “ ”)
( “ ”) ,
.
a
n
+1
-4
a
n
=3×2
n
+1
,
a
n
+1
+3×2
n
+1
=4
(
a
n
+3×2
n
)
.
: , ,
,
. 4 2
n
+1
,
5
a
n
+1
-4
a
n
=3×2
n
+1
6
:
,
2
n
+1
a
n
+
1
2
n
+
1
-
a
n
2
n
=
3
(
a
n
2
n
=
c
n
,
c
n
+1
-
c
n
=3
),
.
: ,
2
,
2
n
+1
, ,
n
+1
,
n
+1
a
n
+1
-4
a
n
=3×2
n
+1
,
2
n
+1
,
4
n
+1
7
:
a
n
+1
-4
a
n
=3×2
n
+1
2
n
+1
,
a
n
+
1
2
n
+
1
-
2
·
a
n
2
n
=
3
,
a
n
2
n
=
b
n
,
b
n
+1
=2
b
n
+3
,
, ,
4
,
b
n
+1
+3=2
(
b
n
+3
)
.
8
:
a
n
+1
-4
a
n
=3×2
n
+1
42
2019 5
4
n
+1
,
a
n
+
1
4
n
+
1
-
a
n
4
n
=
3
2
n
+
1
,
a
n
4
n
=
b
n
,
b
n
+1
-
b
n
=
3
2
n
+
1
,
,
b
n
+1
+
3
2
n
+
1
=
b
n
+
3
2
n
.
: , ,
,
,
, , ,
.
, :
(
1
)
a
n
n
S
n
,
a
n
=
S
1
,
n
=1
,
S
n
-
S
n
-1
,
n
≥
{
2
,
.
:
,
;
a
n
=
S
n
-
S
n
-1
(
n
∈
N
*
,
n
≥
2
)
.
, ,
, ,
.
,
a
n
,
S
n
,
,
.
(
2
)
a
n
+1
=
λ
a
n
+
μ
(
λ
≠
0
,
1
),
a
n
+1
+
x
=
λ
(
a
n
+
x
),
x
=
μ
λ
-1
.
a
n
+1
=
λ
a
n
+
μ
a
n
-1
+
ν
(
λ
≠
0
,
ν
≠
0
),
a
n
+1
+
xa
n
+
y
=
q
(
a
n
+
xa
n
-1
+
y
),
x
,
y
.
a
n
+2
=4
a
n
+1
-4
a
n
+10
,
a
n
+2
-2
a
n
+1
+10=2
(
a
n
+1
-2
a
n
+10
)
.
(
3
)
a
n
+1
=
λ
a
n
+
μ
·
ν
n
(
λ
≠
0
,
μ
≠
0
,
ν
≠
0
,
1
),
:
①
v
n
+1
,
a
n
+1
ν
n
+1
=
λ
ν
·
a
n
ν
n
+
μ
ν
,
a
n
ν
n
=
b
n
,
b
n
+1
=
λ
ν
·
b
n
+
μ
ν
.
λ
=
ν
,
b
n
+1
=
b
n
+
d
(
d
=
μ
ν
, ), ;
λ
≠
ν
,
b
n
+1
=
p
b
n
+
d
(
p
=
λ
ν
,
d=
μ
ν
, ),
2 .
a
n
+
1
=
2
a
n
+
3
×
2
n
+
1
,
2
n
+
1
,
a
n
+
1
2
n
+
1
=
a
n
2
n
+
3
,
b
n
+
1
=
b
n
+
3
,
.
a
n
+
1
=
4
a
n
+
3
×
2
n
+
1
,
2
n
+
1
,
a
n
+
1
2
n
+
1
=
2
·
a
n
2
n
+
3
,
b
n
+
1
=
2
b
n
+
3
,
b
n
+
1
+
3
=
2
(
b
n
+
3
)
.
②
λ
n
+1
,
a
n
+1
λ
n
+1
=
a
n
λ
n
+
μ
λ
·
(
ν
λ
)
n
,
a
n
λ
n
=
b
n
,
b
n
+1
=
b
n
+
μ
λ
·(
ν
λ
)
n
.
λ
=
ν
,
b
n
+1
=
b
n
+
d
(
d
=
μ
λ
, ), ;
λ
≠
ν
,
b
n
+1
=
b
n
+
f
(
n
)(
f
(
n
)
=
μ
λ
·(
ν
λ
)
n
,
), ,
.
a
n
+1
=8
a
n
+3×2
n
+1
,
8
n
+1
,
a
n
+1
8
n
+1
-
a
n
8
n
=
3
4
n
+1
,
b
n
+1
-
b
n
=
3
4
n
+1
,
,
b
n
+1
+
1
4
n
+1
=
b
n
+
1
4
n
.
③
λ
≠
ν
,
a
n
+1
+
x
·
ν
n
+1
=
λ
(
a
n
+
x
·
ν
n
),
x
.
a
n
+1
=2
a
n
+3×2
n
+1
,
a
n
+1
+
p
·
2
n
+1
=2
(
a
n
+
p
·
2
n
);
a
n
+1
-4
a
n
=3×2
n
+1
,
a
n
+1
+3×2
n
+1
=4
(
a
n
+3×2
n
)
.
: , ,
.
,
,
.
9
:
S
n
+1
=4
S
n
-
4
S
n
-1
+10
(
n
∈
N
*
,
n
≥
2
)
,
S
n
+1
-2
S
n
+10=2
(
S
n
-2
S
n
-1
+10
)
.
S
1
=
a
1
=2
,
S
2
=4
a
1
+10=18
,
S
2
52
2019 6
-2
S
1
+10=24
≠
0
, {
S
n
+1
-2
S
n
+10
}
24
,
2
,
S
n
+1
-2
S
n
+10=24×2
n
-1
.
2
n
+1
,
S
n
+1
2
n
+1
-
S
n
2
n
=6
-
5
2
n
,
S
n
2
n
=
c
n
,
c
n
+1
-
c
n
=6-
5
2
n
,
c
1
=
S
1
2
1
=1.
S
n
2
n
=
c
n
=6
n
-10+
5
2
n
-1
,
S
n
=
(
6
n
-10+
5
2
n
-1
)
2
n
=
(
3
n
-5
)
2
n
+1
+10.
S
n
+1
=
(
3
n
-2
)
2
n
+2
+10
S
n
+1
=4
a
n
+10
,
a
n
=
(
3
n
-2
)
2
n
.
: ,
,
.
,
,
, ,
,
.
:
1
{
a
n
}
n S
n
:
S
n
+1
=4
a
n
+10
(
n
∈
N
*
),
a
1
=2.
(
1
)
b
n
=
a
n
+1
-2
a
n
, : {
b
n
}
;
(
2
)
c
n
=
a
n
2
n
, :{
c
n
}
;
(
3
)
a
n
,
S
n
.
:
2
{
a
n
}
n S
n
:
S
n
+1
=4
a
n
+10
(
n
∈
N
*
),
a
1
=2.
(
1
)
b
n
=
S
n
+1
-2
S
n
+10
, :{
b
n
}
, ;
(
2
)
c
n
=
S
n
2
n
, {
c
n
} {
S
n
} ;
(
3
) {
a
n
}
.
: , , ,
,
,
、 , 、
、 、 ,
, ,
、 、 、
, ,
, ,
, ,
.
3
、 ,
, , ,
,
.
,
,
,
.
,
,
.
《 》
[
1
]
:“
,
, ,
.
,
,
,
,
.
”
,
, ,
, , , ,
,
, ,
.
,
.
,
, ,
,
,
, ,
、
.
,
,
,
.
1
( )
.
, ( )
.
[
M
]
.
:
,
2007
( :
2019-09-08
)
62
2019 5