Ответ:163.1
Объяснение: s = (a1 +a7)*7/2
a7 = a1 + 6d = 2.3 + 6*7 = 44.3
s=(2.3 + 44.3) *7/2= 163.1
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Ответ:163.1
Объяснение: s = (a1 +a7)*7/2
a7 = a1 + 6d = 2.3 + 6*7 = 44.3
s=(2.3 + 44.3) *7/2= 163.1