5.
\((1)\)用秦九韶算法计算函数\(f(x)=2{x}^{4}+3{x}^{3}+5x-4当x=2 \)时的函数值是________.
\((2)\)若命题\(p\):对任意\(x\in R,{{x}^{2}}+x+1\ne 0,\)则\(\neg p\)为______________.
\((3)\)如图所示,正方形内有\(4\)个直径为\(2\)的半圆,向正方形内随机投放一个极小颗粒,则此颗粒落在阴影部分的概率是________.
\((4)\)如图所示,已知圆\(O:{x}^{2}+{y}^{2}=4 \)与\(y \)轴的正方向交于\(A \)点,点\(B \)在直线\(y=2 \)上运动,过\(B \)作圆\(O \)的切线,切点为\(C \),则\(∆ABC \)垂心\(H \)的轨迹为________.