Ответ:
S₃₀=675
Объяснение:
Sn= а1+аn/2 * 30
S₃₀ = 15+30/2 * 30
S₃₀ = 45*30/2
S₃₀ = 1350/2 = 675.
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Ответ:
S₃₀=675
Объяснение:
Sn= а1+аn/2 * 30
S₃₀ = 15+30/2 * 30
S₃₀ = 45*30/2
S₃₀ = 1350/2 = 675.