BARISAN DAN DERET ARITMETIKA
By : MONIKA TURI 211 113 234
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A. Barisan Aritmetika • Definisi Barisan aritmetika adalah suatu
•
barisan bilanan yan s!lisih s!tia" dua su#u b!rturutan s!lalu $!ru"a#an bilanan t!ta" %#&nstan'( Bila Bilang ngan an yang yang tet tetap ap ter terse sebu butt diseb disebut ut beda dan dilambangkan dengan b .
• Perhatikan juga barisan-barisan bilangan berikut ini.
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&'nt'h ( a. 1, 4, 7, 1, 1!, ... )!
)!
)!
)!
Pada barisan ini, suku berikutnya diperoleh dari suku sebelumnya ditambah 3. Dapat dikatakan bahwa beda sukunya 3 atau b =3.
b. ", #, 14, ", ... )*
)*
)*
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c.
!, "%, ", 1%, ... +%
+%
+%
Pada barisan ini, suku berikutnya diperoleh dari suku sebelumnya ditambah –5. Dapat dikatakan bahwa beda sukunya –5 atau b = –5. Seara umum dapat dikatakan seba!ai berikut. )i#a Un adalah su#u #!*n dari suatu barisan arit$!ti#a $a#a b!rla#u b = Un – Un + 1(
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%1 = % = %3 = % = %5 = . . . % = 2
4
n
a % % % %
%
'b=a 'b ' b = $a ' b& ' b = a ' (b ' b = $a ' (b& ' b = a ' 3b ' b = $a ' 3b& ' b = a ' )b
1
2 3
4
n
−1
' b = a ' $n – *&b
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&'nt'h 1 ( entukan suku ke#/ dan ke#(0 dari barisan –3, (, 1, *(, .... +awab–3, (, 1, *(, 2 Suku pertama adalah a = –3 dan bedanya b = ( – $–3& = 5. Den!an menyubstitusika menyu bstitusikann a dan b, diperoleh %n= –3 ' $n – *&5.
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&'nt'h " ( Diketahui barisan aritmetika –(, *, ), 1, ..., )0. entukan banyak suku barisan tersebut. +awabDiketahui barisan aritmetika –(, *, ), 1, ..., )0.
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B. Deret Aritmetika • Deinisi Misal#an U1- U2- U3- (((- Un $!ru"a#an su#u*su#u dari suatu barisan arit$!ti#a(
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&'nt'h 1 ( Diketahui suatu barisan aritmetika (, 5, /, **, *). entukan umlah kelima suku barisan tersebut.
+awab+umlah kelima suku (, 5, /, **, *) dapat dituliskanseba!ai dituliskanseba!ai berikut.
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enentukan rumus umum untuk sebagai berikut. Diketahui rumus umum suku ke-n dari barisan aritmetika adalah / a ) 0n + 1b. 2leh karena itu, n
n
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Den!an demikian, diperoleh 4 S = a ' $a ' b& ' $a ' (b& ' ... ' $a ' $n – *&b& n
= a ' $% – $n – (& b& ' $% – $n – 3& b& ' ... ' % ............ $*& n
n
n
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Dari persamaan * dan ( ika kita umlahkan, diperoleh 4
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+adi, rumus umum umlah n suku pertama deret
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&'nt'h "(
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&'nt'h !(
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