Ответ:
Объяснение:
Sn = [tex]\frac{(2a1+d(n-1))n}{2}[/tex]
S14 = (2*9.1+1.3*(14-1))14/2 = [tex]\frac{491.4}{2}[/tex] = 245.7
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Ответ:
Объяснение:
Sn = [tex]\frac{(2a1+d(n-1))n}{2}[/tex]
S14 = (2*9.1+1.3*(14-1))14/2 = [tex]\frac{491.4}{2}[/tex] = 245.7