Решить неравенство:3^2х-12*3х+27 меньше равно 0. Created by natali200117. algebra-ru

Решить неравенство:3^2х-12*3х+27 меньше равно 0...

natali200117 @natali200117

September 2021 1 16 Report

Решить неравенство:3^2х-12*3х+27 меньше равно 0

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PolinkaKro Положим 3^x=t, t>0
t^2-12t+27=0
D=(-12)^2-4*27=144-108=36
t1= 12-6/2=3   t2=12+6/2=9
3^x=3          3^x=9
3^x=3^1       3^x=3^2
x=1             x=2
ответ 1;2

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