Log 2 (2x+1) > 2^2 ( 2 в квадрате) ;
2x+1>2;
2x >2-1;
2x >1;
<span>x > 1\2.</span>
1) 6-(2х-9)=(18+2х)-3(х-3)
6-2х+9=18+2х-3х+9
3х-2х-2х=18-6-9+9
-х=12
х=-12
2) -4(2у-0,9) + 2,4=5,6-10у
2,4-8у+3,6=5,6-10у
10у-8у=5,6-3,6-2,4
2у=- 0,4
у= - 0,2
7
(2y + 3)/4 принадлежит (-4 5)
-4 < (2y + 3)/4 < 5
-16 < 2y + 3 < 20
-19 < 2y < 17
-19/2 < y < 17/2
y ∈ (-19/2, 17/2)
8
|2x + 5| ≤ 15
-15 ≤ 2x + 5 ≤ 15
-20 ≤ 2x ≤ 10
-10 ≤ x ≤ 5
x ∈ [-10, 5]