$a)2p^3+\underline{3p^2}+\underline{\underline{2p}}+\underline{\frac{1}{2}{p}^2}+\underline{\underline{p}}$

$b)\underline{-3x^3{y}^2}+\underline{\underline{2x^2{y}^3}}+\underline{3x^3{y}^2}+2x{y}^3-\underline{\underline{x^2{y}^3}}$