a, Ta có :
\(|x-1|\le3\)
=> \(0\le x-1\le3\)
\(\Leftrightarrow1\le x\le4\)
\(\Rightarrow A=\left[1;4\right]\)
a: |x-1|<=3
=>-3<=x-1<=3
=>-2<=x-1<=4
=>C=[-2;4]
b: \(\left(A\cap B\right)\backslash C=[-2;7)\backslash\left[-2;4\right]=\left(4;7\right)\)
c: \(C_RA\cup\left(B\cap C\right)=[7;+\infty)\cup\left[-2;4\right]=[-2;+\infty)\)