a1 = 20
d = - 2
a6 = ?
a6 = a1 + (n-1)d = 20 + (6-1)×(-2) = 20 - 10 = 10
ответ: 10м
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a1 = 20
d = - 2
a6 = ?
a6 = a1 + (n-1)d = 20 + (6-1)×(-2) = 20 - 10 = 10
ответ: 10м