Question

Quanto é a soma de:

78 + {[(–10) : 2] . 5 - [– 27 : 3 + (– 4) ] .(-6) + 20} =

Answer 1

= 78 + {[(- 10) ÷ 2] . 5 - [- 27 ÷ 3 + (- 4)] . (- 6) + 20}

= 78 + {[- 5] . 5 - [- 9 - 4] . (- 6) + 20}

= 78 + {- 25 - [- 13] . (- 6) + 20}

= 78 + {- 25 + 13 . (- 6) + 20}

= 78 + {- 25 - 78 + 20}

= 78 + {- 103 + 20}

= 78 + {- 83}

= 78 - 83

= - 5

att. yrz

Answer 2

78+{[(-10):2]•5-[-27:3+(-4)]•(-6)+20}=

78+{[(-5•5-[-27:3+(-4)]•-6+20

78{[(-25-[-9-4].-6+20

78+{[(-25-[-13].-6+20

78+{[(-25+13.-6+20

78+{[(-23-78+20]

78-103+20

98-103=-5