Question

IV – Calcule as expressões a seguir: 1º) (7ab + 2ab) – (8ac – 5ac) + (10ad – 7ad) / 2º) (5a - 3a) + (10b – 8b) – (5c + 4c) + 6b + 2c / 3º) mn + 6mn – (4mn + 2mn) / 4º) (3x + 6x + - 7x) – 4x​

Answer 1

Resposta:

1º) (7ab + 2ab) – (8ac – 5ac) + (10ad – 7ad) =

9ab - 3ac + 3ad

2º) (5a - 3a) + (10b – 8b) – (5c + 4c) + 6b + 2c =

2a + 2b - c + 6b + 2c =

2a + 8b + c

3º) mn + 6mn – (4mn + 2mn)

7mn - 6mn =

mn

4º) 3x + 6x + (- 7x) – 4x =

9x + (- 7x ) - 4x =

9x - 7x - 4x =

2x - 4x =

- 2x