a₃ + a₈ + a₁₄ + a₁₉ =38
a₁ + 2d +a₁ + 7d + a₁ + 13d + a₁ + 18d = 38
4a₁ + 40d = 38
2a₁ + 20d = 19
a₄ + a₁₈ = a₁ + 3d + a₁ + 17d = 2a₁ + 20d = 19
Ответ : a₄ + a₁₈ = 19
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Verified answer
a₃ + a₈ + a₁₄ + a₁₉ =38
a₁ + 2d +a₁ + 7d + a₁ + 13d + a₁ + 18d = 38
4a₁ + 40d = 38
2a₁ + 20d = 19
a₄ + a₁₈ = a₁ + 3d + a₁ + 17d = 2a₁ + 20d = 19
Ответ : a₄ + a₁₈ = 19