Question

ПОМОГИТЕ ПЖ СРОЧНО ДАМ 30 баллов

Answer 1

$a) {x}^{2} + 3x + yx + 3y$
$b)10b - 20 - {2b}^{2} + 4b = \\ 14b - 20 - 2 {b}^{2}$
В)
$6ac - {2c}^{2} - {3a}^{2} + ac = \\ 7ac - 2 {c}^{2} - 3 {a}^{2}$
Г)
$5 {x}^{2} - 5xy - (5 {x}^{2} \\ - xy + 5xy - {y}^{2} ) = 5 {x}^{2} - 5xy \\ - (5 {x}^{2} + 4xy - {y}^{2} ) =$
$5 {x}^{2} - 5xy - 5 {x}^{2} - 4xy + {y}^{2} = \\ - 9xy + {y}^{2}$