Question

Calcule o valor das expressões

a)-10+[2-1+(-20+4)]
b)25-[-5-(2-5-1)+3]+9
c)20-4-[4-(-6+10)]
d)+2+{+8-[-5-(+7-2)]-7}
e)25-6 {8-6+[9-(4-2)-5]}
f)45-{2-[5+4+(6-2)-(7+3-9)-6]-7}+8

Answer 1

a)-10+[2-1+(-20+4)]

-10+[1 + (-16)]

-10+[1 - 16]

-10+[-15]

-10 - 15

-25

b)25-[-5-(2-5-1)+3]+9

25-[-5-(-3-1)+3]+9

25-[-5-(-4)+3]+9

25-[-5+4+3]+9

25-[-1+3]+9

25 - 2 + 9

23 + 9

32

c)20-4-[4-(-6+10)]

16 - [ 4 - (4)]

16 - [ 4 - 4]

16 - 0

16

d)+2+{+8-[-5-(+7-2)]-7}

2 +{ 8 - [ - 5 - 5] - 7}

2 +{8 - [-10] - 7}

2 +{8 + 10 - 7}

2 +{18 - 7}

2 +11

13

e)25-6 {8-6+[9-(4-2)-5]}

19 {2 + [9 - 2] - 5

19 {2 + 7 - 5}

19 {9 - 5}

19 {4}

76

f)45-{2-[5+4+(6-2)-(7+3-9)-6]-7}+8

45-{2 - [9 + 4 - (10 - 9) - 6] - 7} +8

45-{2 - [13 - 1 - 6]-7} +8

45-{2 - [12 - 6] - 7} +8

45-{2 - 6 - 7} +8

45-{-4 - 7} +8

45 - {-11} + 8

45 + 11 + 8

56 + 8

64