计算：

\((1){{\left( -{{a}^{2}} \right)}^{3}}-6{{a}^{2}}\bullet {{a}^{4}}\)                          \((2){\left(p-q\right)}^{4}÷{\left(q-p\right)}^{3}·{\left(p-q\right)}^{2} \)

\((3){{(3.14-\pi )}^{0}}-{{3}^{2}}+\left| -4 \right|+{{(\dfrac{1}{2})}^{-1}}\)              \((4)(x+1)({{x}^{2}}-2x-3)\)  

\((5)(2a+b)(b-2a)-(a-3b)^{2}\)                     \((6)\)  \({{(x+1)}^{2}}{{(x-1)}^{2}}\)