Срочно нужна помощь, номера 1 и 3

Решите задачу:

$1) {x}^{2} y + x {y}^{2} - ( {2x}^{3} - {xy}^{2} + 2 {xy}^{2} \\ - {y}^{3} ) = {x}^{2} y + {xy}^{2} - 2 {x}^{3} + {xy}^{2} \\ - 2 {xy}^{2} + {y}^{3} = {x}^{2} y -2 {x}^{3} + {y}^{3}$
$3) {p}^{5} - 3k {p}^{3} - 3k {p}^{2} - {9k}^{2} - \\ ( {p}^{5} + 3k {p}^{2} - 3k {p}^{3} - 9 {k}^{2} ) = {p}^{5} - \\ 3 {kp}^{3} - 3 {kp}^{2} - {9k}^{2} - {p}^{5} - 3 {kp}^{2}$
$+ 3 {kp}^{3} + 9 {k}^{2} = - 6 {kp}^{2}$