a₁₇ = 2.5
Объяснение:
a₁₀ = a₁ + 9d
a₂₄ = a₁ + 23d
a₁₇ = a₁ + 16d
a₁₀ + a₂₄ = a₁ + 9d + a₁ + 23d = 2a₁ + 32d = 2(a₁ + 16d) = 2a₁₇ = 5
a₁₇ = 5 : 2
a₁₇ = 2.5
Объяснение:
a₁₀ = a₁ + 9d
a₂₄ = a₁ + 23d
a₁₇ = a₁ + 16d
a₁₀ + a₂₄ = a₁ + 9d + a₁ + 23d = 2a₁ + 32d = 2(a₁ + 16d) = 2a₁₇ = 5
a₁₇ = 5 : 2
a₁₇ = 2.5