Question

a) 6 × {3 + [(9 × 3 - 22 ) + 2 ] }=
b) 62 - [ 10 + ( 2 × 8 - 6 ) + 5 ] =
c) 8 × [ 17 - ( 5 × 2 + 3 ) ] =
d) 76 - [12 + (4 × 4 -8 ) × 3]=
e) [49 - (6 × 6 - 15 - 15 ) + 7]=

Answer 1

Olá, Larissa. (=^.^=)/

A) 6×{3+[(9×3-22)+2]} = 60
B) 62-[10+(2×8-6)+5] = 37
C) 8×[17-(5×2+3)] = 32
D) 76-[12+(4×4-8)×3] = 40
E) [49-(6×6-15-15)+7] = 50

A) 6×{3+[(9×3-22)+2]} =

6.{3+[(27-22)+2]} = 
6.{3+[5+2]} = 
6.{3+7} = 
6.10 = 60

B) 62-[10+(2×8-6)+5] =

62-[10+(16-6)+5] = 
62-[10+10+5] = 
62-[25] = 
62-25 = 37

C) 8×[17-(5×2+3)] =

8.[17-(10+3)] = 
8.[17-(13)] = 
8.[17-13] = 
8.4 = 32

D) 76-[12+(4×4-8)×3] =

76-[12+(16-8).3] = 
76-[12+8.3] = 
76-[12+24] = 
76-[36] = 
76-36 = 40

E) [49-(6×6-15-15)+7] =

[49-(36-15-15)+7] = 
[49-(36-30)+7] = 
[49-(6)+7] = 
[49-6+7] = 
[56-6] = 50

Regras dos sinais:

+ com + = +
- com - = +
- com + = -
+ com - = -

Bons estudos! :-)