Question

1- Resolva essas operações: a) +28 – ( - 20 + 10 + 4 ) b) 20 – ( - 8 + 15 + 9 ) c) 14 – ( - 68 ) – ( - 42 ) – ( + 16 ) d) – ( 10 + 8 – 2 - 4 ) e) + 120 – 72 + 15 – 54 + 36 – ( 24 + 35 ) f) – 200 – ( - 56 – 74 ) g) – ( + 68 – 8 ) + ( - 10 + 6 ) h) 40 + ( - 7 ) + ( + 81 ) + ( - 3 ) + 0 i) -20 + ( - 5 + 4 ) + 21 j) 14 – 12 – ( 68 + 36 – 26 ) k) 56 + { 12 - ´[ 18 + 2 – ( 4 – 6 ) – 3]} l) + ( 40 + 4 ) – ( 23 – 7 ) + 2 m) – ( 30 – 28 + 30 ) – 100

Answer 1

a) +28 – ( - 20 + 10 + 4 )

28+34

62

b) 20 – ( - 8 + 15 + 9 )

20+32

52

c) 14 – ( - 68 ) – ( - 42 ) – ( + 16 )

14+68+42-16

82+42-16

124-16

108

d) – ( 10 + 8 – 2 - 4 )

-12

e) + 120 – 72 + 15 – 54 + 36 – ( 24 + 35 )

120 – 72 + 15 – 54 + 36 –59

-14

f) – 200 – ( - 56 – 74 )

-200+18

-218

g) – ( + 68 – 8 ) + ( - 10 + 6 )

-60-16

-44

h) 40 + ( - 7 ) + ( + 81 ) + ( - 3 ) + 0

40-7+81-3+0

33+81-3+0

111

i) -20 + ( - 5 + 4 ) + 21

-30-9+21

-21+21

-42

j) 14 – 12 – ( 68 + 36 – 26 )

14-12-78

-76

k) 56 + { 12 - ´[ 18 + 2 – ( 4 – 6 ) – 3]}

essa eu não lembro como que é

l) + ( 40 + 4 ) – ( 23 – 7 ) + 2

44-16+2

28+2

30

m) – ( 30 – 28 + 30 ) – 100

-32-100

-68

espero ter ajudado...