Question

Ajuda ai ,20 pontos...​

Answer 1

4-a)

$- 4xy + 6xy - 5xy = xy(6 - 4 - 5) = - 3xy$

4-b)

$\frac{3}{2} {x}^{2} + \frac{2}{3} {x}^{2} - \frac{7}{6} {x }^{2} = \left( \frac{3}{2} + \frac{2}{3} + - \frac{7}{6} \right) {x}^{2} = ( \frac{13}{6} - \frac{7}{6})x^2 = - x^2$

5-a)

$(4 {a}^{2} {x}^{3}) \times ( - 5a {x}^{2} ) = - 20 {a}^{3} {x}^{5}$

5-b)

$\frac{16 {x}^{5} }{ - 4 {x}^{3} } = - 4 {x}^{2}$