(4)
3^2x-1 - 3^2x + 3^2x+3 = 237
3^2x-1(1-3+3^4) = 237
3^2x-1 * (79) = 237 | : 79
3^2x-1 = 3
2x-1 = 1
2x = 2
x =1
Ответ 1
log2 (3-2x) - log2 13 < 0
log2 (3-2x) < log2 13
3-2x > 0 => 2x < 3 = > x<1,5<br> 3-2x > 13 => 2x > -10 => x > -5
--o######o--
-5 1,5
Ответ (-5 ; 1,5)