Задача 12305 1/3^(x-1)+1/3^x+1/3^(x+1) < 52...

u17825219383

17.12.2016

1/3^(x-1)+1/3^x+1/3^(x+1) < 52

SOVA

17.12.2016

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(1/3)^(x-1)*(1+(1/3)+(1/3)^2) < 52;
(1/3)^(x-1)*(13/9) < 52
(1/3)^(x-1) < 36
x -1 > log_(1/3)36
х > 1+log_(1/3)36