Question

Mim ajuda a fazer essa conta 180:{10+20x[20-45:(13-2x5)]}

Answer 1

180:{10+20x[20-45:(13-2x5)]}

Passo 1: Resolver o parenteses 
180:{10+20x[20-45:(13-10)]}
180:(10+20x[20-45:3]}

Passo 2: Resolver o cholchetes
180:{10+20x[20-15]}
180:{10-20x5}

Passo 3: Resolver a chaves
180:{10-100}
180: (-90)
-2
a resposta é  -2