a₁ = - 5 a₂ = - 3
a₂ = a₁ + d
d = a₂ - a₁ = - 3 - (- 5) = - 3 + 5 = 2
a₁₁ = a₁ + 10d = - 5 + 10 * 2 = - 5 + 20 = 15
Ответ : a₁₁ = 15
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Answers & Comments
a₁ = - 5 a₂ = - 3
a₂ = a₁ + d
d = a₂ - a₁ = - 3 - (- 5) = - 3 + 5 = 2
a₁₁ = a₁ + 10d = - 5 + 10 * 2 = - 5 + 20 = 15
Ответ : a₁₁ = 15
Verified answer
An=a1+(n-1)dd=a2-a1
d=-3-(-5)=2
a11=-5+10*2=15
Відповідь: а11=15.