Calcule as expressões abaixo:
A) 45 – 35 – 25 – 15 = 45 – 35 = 10
10 – 25 – 15 = 10 – 25 = – 15
– 15 – 15 = – 30
B) – 35 + 15 – 25 + 5 =
C) – 5 + 25 – 35 + 15 =