Question

por favor me ajudem!! olhem a foto ​

Answer 1

a)

$3xy + 2xy + 7x {y}^{4} - 10x {y}^{4} - 6 {x}^{3} y \\ = 5xy - 3x {y}^{4} - 6 {x}^{3} y$

b)

$ab + 2ab - ab + 5ab - 3cd + 3cd \\ = 7ab$

c)

${x}^{3} + 3 {x}^{3} + 7 {x}^{2} + 4y \\ = 4 {x}^{3} + 7 {x}^{2} + 4y$

d)

$3 {x}^{2} - 7 {x}^{2} - 5 {x}^{2} + 4 {x}^{3 } = - 9 {x}^{2} + 4 {x}^{3}$

e)

$4 {x}^{3} + {x}^{3} - 2 {x}^{2} + 5 {x}^{2} - 4y + 8y \\ = 5 {x}^{3} + 3 {x}^{2} + 4y$