Ответ:
1) s = a1 + an/2 × n = 5+ 15/ 2 * 10 = 100
2) s = 0.5 + 9.5/2 * 4 = 20
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Ответ:
1) s = a1 + an/2 × n = 5+ 15/ 2 * 10 = 100
2) s = 0.5 + 9.5/2 * 4 = 20