Элементы дискретной математики. Часть I - 77 стр.

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C
1
C
2
a
0
=1
a
1
=4
,
C
1
=1
(
3
8
+ C
2
+ C
1
) · 2=4
,
C
1
=1
C
2
=
5
8
.
a
n
=(3n
2
+5n +8)· 2
n3
.
a
n+2
3a
n+1
+2a
n
=6n
2
4n 13,
a
0
=5,a
1
=6.
x
2
3x +2=0
1
=1
2
=2.
ϕ(n)=P
s
(n),P
s
(n)=6n
2
4n 13,s=2.
k =1.
a
n
= n
k
· Q
s
(n)=n · (b
2
n
2
+ b
1
n + b
0
)=b
2
n
3
+ b
1
n
2
+ b
0
n.
[b
2
(n +2)
3
+ b
1
(n +2)+n
0
(n +2)]+[3b
2
(n +1)
3
3b
1
(n +1)
2
3b
0
(n +1)]+
+[2b
2
n
3
+2b
1
n
2
+2b
0
n]=3b
2
n
2
+(3b
2
2b
1
)n +(5b
2
+ b
1
b
0
).
3b
2
n
2
+(3b
2
2b
1
)n +(5b
2
+ b
1
b
0
)=6n
2
4n 13.
3b
2
=6,
3b
2
2b
1
= 4,
5b
2
+ b
1
b
0
= 13.
b
2
=
6
3
= 2,
b
1
=
1
2
(4 3b
2
)=1,
b
0
= (13 5b
2
b
1
)=2.
a
n
= 2n
3
n
2
+2n.
a
n
= C
1
· 1
n
+ C
2
· 2
n
= C
1
+ c
2
· 2
n
.
a
n
= a
n
+ a
n
= C
1
+ C
2
· 2
n
2n
3
n
2
+2n.