Question

resolva cada expressão abaixo
20-{-10-[-8+(5-12)]-20}

Answer 1

20-{-10-[-8+(-7)]-20}:
20-{-10-[-8-7]-20}:
20-{-10-[-15]-20}:
20-{-10+15-20}:
20-{-15}:
20+15:
35

Answer 2

20-{-10-[-8+(5-12)]-20}
20-{-10-[-8+(-7)]-20}
20-{-10-[-15]-20}
20-{-10+15-20}
20-{-15}
20+15
35