Question

1) calcule o valor das expressões

a) 15 - (3 - 2) + (7 - 4)
b) (10 - 2) - (8+7-5)
c) 18 - [2+(7-3-8) - 10]
d) -6-[10+(-8-3)-1]
e) 25- {-2+[6+(-4-1)}]
f) 3-[-5-{8-2+(-5+9)}]
g) {2+[1+(-15-15)-2]}
h) 20 + [{7+5+(-9+7)+3]}
i) 10 - {-2+[+1+(+7-3)-2]+6}

Answer 1

Explicação passo-a-passo:

a) 15 - (3 - 2) + (7 - 4)

15 - 1 + 3

17

b) (10 - 2) - (8+7-5)

8 - 10

- 2

c) 18 - [2+(7-3-8) - 10]

18 - [2+(- 4) - 10]

18 - [- 2- 10]

18 - [ - 12]

18 + 12

30

d) -6-[10+(-8-3)-1]

-6-[10+(-11)-1]

-6-[- 1-1]

-6-[ - 2]

- 6 + 2

- 4

e) 25- {-2+[6+(-4-1)}]

25- {-2+[6+(- 5)}]

25- {-2+[ 1}]

25 - { -1}

25 + 1

26

f) 3-[-5-{8-2+(-5+9)}]

3-[-5-{8-2+(4)}]

3-[-5-{6 + 4}]

3-[-5-{10}]

3-[-15]

3+ 15

18

g) {2+[1+(-15-15)-2]}

{2+[1+(-30)-2]}

{2+[1+(-32)]}

{2+[- 31]}

- 29

h) 20 + [{7+5+(-9+7)+3]}

20 + [{7+5+(- 2)+3]}

20 + [{12+(-2)+3]}

20 + [{10+3]}

20 + [{13]}

33

i) 10 - {-2+[+1+(+7-3)-2]+6}

10 - {-2+[+1+(4)-2]+6}

10 - {-2+[5-2]+6}

10 - {-2+[3]+6}

10 - {1+6}

10 - { 7 }

3