арифметическая прогрессия
a(n) = a(1) + d(n - 1)
d = a(2) - a(1)
d = a(3) - a(2)
log(2) 1/x , log(2) x , log(2) 27
a(1) = log(2) 1/x ,
a(2) = log(2) x ,
a(3) = log(2) 27
для такой последовательности чисел необходимо
log(2) 27 - log(2) x = log(2) x - log(2) 1/x
log(2) 27/x = log(2) x^2
27/x = x^2
x^3 = 27
x = 3
последовательность log(2) 1/3 , log(2) 3 , log(2) 27 или
- log(2) 3 , log(2) 3 , 3log(2) 3
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арифметическая прогрессия
a(n) = a(1) + d(n - 1)
d = a(2) - a(1)
d = a(3) - a(2)
log(2) 1/x , log(2) x , log(2) 27
a(1) = log(2) 1/x ,
a(2) = log(2) x ,
a(3) = log(2) 27
для такой последовательности чисел необходимо
log(2) 27 - log(2) x = log(2) x - log(2) 1/x
log(2) 27/x = log(2) x^2
27/x = x^2
x^3 = 27
x = 3
последовательность log(2) 1/3 , log(2) 3 , log(2) 27 или
- log(2) 3 , log(2) 3 , 3log(2) 3