Resposta :
Resposta:
30 – (18 + 19) – [13 – (14 – 21)]
30-37-[13+7]
-7-13+7
-20+7
-13
Resposta:
30 – (18 + 19) – [13 – (14 – 21)]
30 – 37 – [13 – (14 – 21)]
30 – 37 – [13 – (-7)]
30 – 37 – [13 +7]
30 – 37 – 20
-7-20
Resposta:
30 – (18 + 19) – [13 – (14 – 21)]
30-37-[13+7]
-7-13+7
-20+7
-13
Resposta:
30 – (18 + 19) – [13 – (14 – 21)]
30 – 37 – [13 – (14 – 21)]
30 – 37 – [13 – (-7)]
30 – 37 – [13 +7]
30 – 37 – 20
-7-20