W ciągu arytmetycznym pierwszy wyraz wynosi 7 zaś dwudziesty dziewiąty wynosi 133. Jaka jest różnica ciągu?
a1 = 7
a29 = 133
r = ?
an = a1 + (n - 1) * r
a29 = a1 + (29 - 1) * r
a29 = a1 + 28 * r
133 = 7 + 28r
133 - 7 = 28r
126 = 28r
r = 126 : 28
r = 4,5 --------- odpowiedź
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a1 = 7
a29 = 133
r = ?
an = a1 + (n - 1) * r
a29 = a1 + (29 - 1) * r
a29 = a1 + 28 * r
133 = 7 + 28r
133 - 7 = 28r
126 = 28r
r = 126 : 28
r = 4,5 --------- odpowiedź