Sn =
!
|
1. Membuktikan
rumus Barisan Aritmatika,
2. Membuktikan
rumus Deret Geometri,
3. Memberikan
5 contoh Barisan Aritmatika!
4. Memberikan
5 contoh Deret Geometri!
Sn =
!
|
1.
Membuktikan
Rumus Barisan Aritmatika
Terbukti
2.
Membuktikan Rumus Deret
Geometri
_
Terbukti
3. Contoh
(5) Barisan Aritmatika
a) Jika
diketahui
Sn
=
3, 5, 7, 9,……….., 27 = Sn =
3 + 5 + 7
+ 9 + ….. + 27 =
Sn = 6,5 ( 6 + (12) 2)
27 + 25+ 23 + 21 + …..
+ 3 = Sn + = 6,5 ( 30 )
30
+ 30+ 30 + 30 + ….. + 30 =
2 Sn Sn
= 195
13
x 30 = 2 Sn
= Sn à Sn = 195
b)
Sn =
=
= 3( 10 + 35)
= 3 ( 45 )
Sn = 135
|
5, 12, 19, …….., 37 =
Sn
5
+ 12 +
19 + …… + 40 =
Sn
40 +
33 + 26 +
…… + 5 = Sn +
45 +
45 + 45 +
…… + 45 = 2 Sn
6
x 45 = 2 Sn
= Sn
135
= Sn
c)
Sn =
=
= 4,5 ( 4 + 40)
= 4,5 ( 44)
Sn = 198
|
2, 7, 12, 17, …….. , 42 =
Sn
2
+ 7 +
12 + 17
+ ….. + 42 =
Sn
42 + 37 + 32
+ 27 + ….. +
42 = Sn
+
44
+ 44 + 44 +
44 + …... +
44 = 2 Sn
9
x 44 = 2 Sn
= Sn
198 = Sn
d)
Sn =
=
= 6 ( 4 + (11) 4 )
= 6 ( 4 + 44 )
= 6 ( 48 )
Sn = 288
|
2, 6, 10, 14, …… , 46 =
Sn
2
+ 6 +
10 + 14
+ ….. +
46 =
Sn
46 + 42 +
38 + 34 + ….. +
2 =
Sn +
48
+ 48 + 48
+ 48 +
….. + 48 = 2 Sn
12
x 48 = 2 Sn
= Sn
288 =
Sn
e)
Sn =
=
= 5 ( 10 + 18)
= 5 ( 28 )
Sn = 140
|
5,
7, 9, 11, 13, …… , 23 = Sn
5
+ 7 +
9 + 11
+ 13 +
…… + 23
= Sn
23 + 21 + 19
+ 17 + 15
+ …… +
5 = Sn
+
28 + 28 +
28 + 28 + 28
+ …… + 28
= 2 Sn
10
x 28 = 2 Sn
= Sn
140
= Sn
4.
=
=
=
=
=
= 255
|
a) Jika
diketahui
Maka,
( 1 - 2 )
=
1 – 1.
=
=
=
= 255
=
=
=
=
=
= 189
|
b) Jika diketahui
= 3 + 6 +
12 + 24 +
….. + 96
=
6 + 12 + 24 + …. + 96 +
192
=
3 - 3.
=
=
=
=
= 189
c)
=
=
=
=
=
= 2186
|
=
2 + 6 + 18 +
54 + ….. + 1458
= 6 +
18 + 54 +
…. + 1458 + 4374
= 2 - 2.
=
=
=
=
= 2186
d)
=
=
=
=
=
= 436905
|
=
5 + 20
+ 80 +
320 + ….. + 327680
= 20 + 80
+ 320 + …. + 327680 +
1310720
=
5 - 5.
=
=
=
=
=
436905
e)
=
=
=
=
=
= 3279
|
=
3 + 9
+ 27 +
81 + ….. + 2187
= 9 +
27 + 81 +
…. + 2187 + 6561
= 3 - 3.
=
=
=
=
=
3279
0 komentar:
Posting Komentar
Guna Pengembangan Blog ini admin mohon komentarnya_terimakasih.