(1-2x) ≤ 4
-2x ≤ 4-1
-2x ≤ 3
x ≥ -дробь 3/2
|1-2x|≤4
1) 1-2x≤4
-2x≤4-1
-2x≤3
x≥-3/2
2) 1-2x≥-4
-2x≥-4-1
-2x≥-5
x≤5/2
[-3/2; 5/2]
(1-2x) ≤ 4
-2x ≤ 4-1
-2x ≤ 3
x ≥ -дробь 3/2
|1-2x|≤4
1) 1-2x≤4
-2x≤4-1
-2x≤3
x≥-3/2
2) 1-2x≥-4
-2x≥-4-1
-2x≥-5
x≤5/2
[-3/2; 5/2]