Question

Resolva as seguintes expressões numéricas:

a) [( 14 . 2 + 5) : 11] – 3

b) (36 -16) – [(3 .2) : (2 . 3)] – 2 . 9

c) 1000 – {100 + 5 . [188 – 25 + 3 . (10 – 8)]}​

Answer 1

Resposta:

a)(2a+b)² - (a-b)²

= (2a)² + 2.(2a).b + b² -(a² - 2ab + b²)

= 4a² + 4ab + b² - a² + 2ab - b²

= 3a² + 6ab (porque 4a² - a² = 3a²; 4ab + 2ab = 6ab; b² - b² = 0)

= 3a² + 6ab