Дана арифметическая прогрессия:
[tex]a_{3} +a_{4} +a_{5} =18[/tex]
Найти
[tex]a_{4} [/tex]
[tex]a_{3} +a_{4} +a_{5} =18[/tex]
Найти
[tex]a_{4} [/tex]
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Answers & Comments
a₅ = a₄ + d
a₃ + a₄ + a₅ = a₄ - d + a₄ + a₄ + d = 3a₄
3a₄ = 18
a₄ = 6
Verified answer
A4=xa3=x-d
a5=x+d
a3+a4+a5=3*x=18
x=18/3=6