Объяснение:
d = a2 - a1 = 6 - 0 = 6
Тогда S4 = 0 + 6 + 12 + 18 = 36
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Объяснение:
d = a2 - a1 = 6 - 0 = 6
Тогда S4 = 0 + 6 + 12 + 18 = 36