Question

Vamos calcular: a) 5a 2m ∙ (3a – 2am) = b) (3a + 2b ∙) (2a – 5b) = c) 5x ∙ (2x2 – 1) = d) – 4ab ∙ (a2 – 2ab – b 2 ) =

Answer 1

Resposta:

a) 5a . 2m ∙ (3a – 2am) = 10am . (3a – 2am) = 30a²m - 20a²m²

b) (3a + 2b ) (2a – 5b) = 6a² - 15ab + 4ab - 10b² = 6a² - 11ab - 10b²

c) 5x ∙ (2x² – 1) = 10x³ - 5x

d) – 4ab ∙ (a² – 2ab – b² ) = - 4a³b + 8a²b² + 4ab³