Question

pfvrr é pra amanhã

Calcule as expressões numéricas abaixo.

a) ( - 2) + ( - 5) . ( - 3 ) = 

b) ( −5)2- 3 + 1 = 

c) ( +1) + ( + 6) – ( - 2) + ( - 9) =  

d) ( - 18) : ( - 2) x ( + 3) =  

e) ( - 9) – (+ 5) + ( + 1) =

f) [(18 + 3 . 2) ÷ 8 + 5 . 3] ÷ 6 =

g) - 15 + [- 4 - ( -5 + 20)] = 

h) 20 - {-10 + [ + 20 - ( -20 + 10)]} = 
​

Answer 1

Resposta:

A) ( - 2) + ( - 5) . ( - 3 )

-2+(-5).(-3)

-2+15 = 13

Resposta: 13

b) ( −5)2- 3 + 1

-10-3+1

-10-3+1=-12

Resposta: -12

c) ( +1) + ( + 6) – ( - 2) + ( - 9)

1+6-(-2)+(-9)

1+6+2(-9)

1+6+2-9 = 0

Resposta:0

d) ( - 18) : ( - 2) x ( + 3)

$\frac{18}{2} .x.3$

9x.3 = 27x

Resposta: 27x

e) ( - 9) – (+ 5) + ( + 1)

(-9)-5+1

-9-5+1 = -13

Resposta: -13

f) [(18 + 3 . 2) ÷ 8 + 5 . 3] ÷ 6

[$\frac{24}{8} +15]:6$

[3+15]:6

$\frac{18}{6} =3$

Resposta: 3

g) - 15 + [- 4 - ( -5 + 20)]

-15(-4-(5+20)]

-15(-4-15)

-15.(-19) = 285

Resposta: 285

h) 20 - {-10 + [ + 20 - ( -20 + 10)]}

20-{-10+[+21-(21+10)]}

20-[-10+[21-(-11)]}

20-[-10+[21+11)]}

20-[-10+32)

20-(=10+32)

20-22 = -2

Resposta = -2