已知\(P=\left\{ x\left| {{x}^{2}}-8x-20\leqslant 0 \right. \right\},\)非空集合\(S=\left\{ x\left| 1-m\leqslant x\leqslant 1+m \right. \right\}.\)
\((\)Ⅰ\()\)若\(x\in P\)是\(x\in S\)的必要条件,求实数\(m\)的取值范围;
\((\)Ⅱ\()\)若\(x∈{C}_{R}P \)是\(x∈{C}_{R}S \)的必要不充分条件,求实数\(m\)的取值范围.