Hitunglah 47+52+57+..........+217
Matematika
muhammadzakirifsy
Pertanyaan
Hitunglah 47+52+57+..........+217
1 Jawaban
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1. Jawaban Nik001
Mapel : Matematika
Bab : Barisan dan Deret Aritmatika
a = 47
b = 52 - 47 = 5
Un = bn + a - b
217 = 5n + 47 - 5
217 = 5n + 42
5n = 217 - 42
5n = 175
n = 175/5
n = 35
Sn = n/2 ( a + Un )
S35 = 35/2 ( 47 + 217 )
S35 = 35/2 x 264
S35 = 35 x 132
S35 = 4.620