\((1)\)命题:“\({∀}x{∈}R\),\(x^{2}{+}2x{+}m{\leqslant }0\)”的否定是______ .
\((2)\)已知\(A{=}\{ x{|}x^{2}{-}x{\leqslant }0\}\),\(B{=}\{ x{|}2^{1{-}x}{+}a{\leqslant }0\}\),若\(A⊆B \),则实数\(a\)的取值范围是______ .
\((3)\) 已知边长分别为\(a\),\(b\),\(c\)的三角形\(ABC\)面积为\(S\),内切圆\(O\)的半径为\(r\),连接\(OA\),\(OB\),\(OC\),则三角形\(OAB\),\(OBC\),\(OAC\)的面积分别为\(\dfrac{1}{2}{cr}{,}\dfrac{1}{2}{ar}{,}\dfrac{1}{2}{br}\),由\(S{=}\dfrac{1}{2}{cr}{+}\dfrac{1}{2}{ar}{+}\dfrac{1}{2}{br}\)得\(r{=}\dfrac{2S}{a{+}b{+}c}\),类比得四面体的体积为\(V\),四个面的面积分别为\(S_{1}\),\(S_{2}\),\(S_{3}\),\(S_{4}\),则内切球的半径\(R{=}\)______.
\((4)\)若集合\(A_{1}\),\(A_{2}\)满足\(A_{1}{∪}A_{2}{=}A\),则称\((A_{1}{,}A_{2})\)为集合\(A\)的一种分析,并规定:当且仅当\(A_{1}{=}A_{2}\)时,\((A_{1}{,}A_{2})\)与\((A_{2}{,}A_{1})\)为集合\(A\)的同一种分析,则集合\(A{=}\{ a_{1}{,}a_{2}{,}a_{3}\}\)的不同分析种数是______ .