在括号内填上适当的数:
\((1)x^{2}+4x+(\)________\()=(x+\)________\()^{2}\);
\((2){{x}^{2}}+(\_\_\_\_\_\_\_\_)x+\dfrac{25}{4}={{(x-\_\_\_\_\_\_\_\_)}^{2}}\);
\((3){{x}^{2}}-\dfrac{4}{3}x+(\_\_\_\_\_\_\_\_)={{(x-\_\_\_\_\_\_\_\_)}^{2}}\);
\((4)x^{2}+px+(\)________\()=(x+\)________\()^{2}\);