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аn = a1 + d(n - 1)
Составляем систему уравнений
a1 + 4d = 71
a1 + 10d = 49
а1 = 71 - 4d
71 - 4d + 10d = 49
6d = 49 - 71
6d = - 22
d = - 22/6
d = - 3 2/3
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Verified answer
аn = a1 + d(n - 1)
Составляем систему уравнений
a1 + 4d = 71
a1 + 10d = 49
а1 = 71 - 4d
71 - 4d + 10d = 49
6d = 49 - 71
6d = - 22
d = - 22/6
d = - 3 2/3