5.
\((1)\)在\((2-{{x}^{3}}){{(1+x)}^{5}}\)的展开式中,\({{x}^{5}}\)的系数是__________.
\((2)\)已知数列\(\{a_{n}\}\)的通项公式是\(a_{n}=2n-3\),将数列中各项进行如下分组:第\(1\)组\(1\)个数\((a_{1})\),第\(2\) 组\(2\)个数\((a_{2},a_{3})\)第\(3\)组\(3\)个数\((a_{4},a_{5},a_{6})\),依次类推,\(……\),则第\(16\)组的第\(3\)个数是______.
\((3)\)若命题“存在\(x∈(1,2)\),满足不等式\(x^{2}+mx-4\geqslant 0\)”是假命题,则\(m\)的取值范围是________.
\((4)\)已知\(x,y\)满足约束条件\(\begin{cases} & x-y+6\geqslant 0 \\ & x\leqslant 3 \\ & x+y+k\geqslant 0 \end{cases}\),且\(z=2x+6y\)的最小值为\(-6\).
\(1)\)常数\(k=\)_______________\(;\)
\(2)\)若实数\(x\in \left[ -\dfrac{5}{2},3 \right],y\in \left[ -2,9 \right]\),则点\(P\left( x,y \right)\)落在上述区域内的概率为_________.