Question

Решите 1,2,3 заранее спасибо!

Answer 1

1) не знаю с:
2) 2.
3) 1.
$- {a}^{4} + 4 {a}^{3} - 5 {a}^{4} + 3 {a}^{2} - 2 {a}^{3} - 5 {a}^{2} = \\ = 2 {a}^{3} - 6 {a}^{4} - 2 {a}^{2}$
2.
$3 + 3 {x}^{5} - 4 {x}^{3} - 8 {x}^{5} + 4 {x}^{3} - 2 {y}^{5} - 9 = \\ = - 6 - 5 {x}^{5} - 2 {y}^{5}$
3.
$9 {x}^{2} y - 6x {y}^{2} - 4 {x}^{2} y + 3 {x}^{2} y - 3x {y}^{2} = \\ = 8 {x}^{2} y - 9x {y}^{2}$
4.
$4a {b}^{3} + 9 {a}^{2} {b}^{2} - a {b}^{3} - 5 {a}^{2} {b}^{2} - 3 {a}^{2} {b}^{2} - 5 = \\ = 3a {b}^{3} + {a}^{2} {b}^{2} - 5$