Question

Calcule : a) 6+1-5+8+0-4=

Answer 1

Agrupando os algarismos de acordo com o sinal:
(6+1+8+0)(-5-4) = 15 - 9 = 6

Answer 2

6+1-5+8+0-4
7-5+8+0-4
2+8+0-4
10+0-4
10-4
6