1– calcule as expressões: a) 2 + 8 – 3 – 5 + 15 = b) 12 + [35...

a) 2+8-3-5+15

2+8+15-3-5

10+15-8

25-8

=17

b) 12+[35-(10+2)+2]

12+[35-12+2]

12+[23+2]

*Elimine os parênteses*

12+25

=37

c) [(18+3 x 2) : 8+5 x 3] : 6

[(18+6) : 8+15] : 6

[24 : 8+15] : 6

[3+15] : 6

18 : 6

=3

d) 37+[-25-(-11+19-4)]

37+[-25-(8-4)]

37+[-25-4]

37-29

=8

e) -8+{-5+[(8-12)+(13+12)]-10}

-8+{-5+[-4+25]-10}

-8+{-5+21-10}

-8+6

=2

f) 3-{2+(11-15)-[5+(-3+1)+8}

3-{2+(-4)-5+(-2)+8)

3-{-4-5+8)}

3-{-1}

3+1

= 4

g) [-1+(22-5 x 6)] : (-5+2)+1

[-1+(22 -30)] : (-3)+1

[-1-8] : (-3)+1

-9 : (-3)+1

3+1

=4

Explicação passo-a-passo: