Tentukan nilai suku pertama (a) dan beda (b) dari barisan aritmatika berikut
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Jawab:
a=71.5
b=-4.5
Penjelasan dengan langkah-langkah:
U14 = 13=a+13b
U10 = 31=a+9b
eliminasikan
4b=-18
b=-4.5
substitusikan nilai b
31=a-40.5
a=71.5