Question

решить неравенства (1/9)^x-6*(1/3)^x-27<=0

Answer 1

(1/9)^x-(6/18)^x-27<=0;             6/18=1/3
(1/9)/(1/3)-27<=0;
(1/9)/(3/1)-27<=0;
3/9-27<=0;
1/3-27<=0;                            |:3
1-9<=0;  
-8<=0;  

          [-8;0]
____________-8\\\\\ ______>x
Ответ:[-8;0]