Question

calcule o valor das seguintes expressões numéricas :
a) 81 + ( - 20 ) × ( + 4 )

b) ( - 4 ) × ( - 7 ) - 30

c) - 23 - ( - 6 ) × ( + 3 )

d) ( - 9 ) × ( + 6 ) - ( + 2 ) × ( - 27 )

e) 19 - ( - 4 ) × ( + 5 )

f) 7 × ( - 3 ) - 9 × ( - 6 ) + 11 × ( - 2 )

g) ( + 5 ) × ( + 11 ) - 37 - ( - 2 ) × ( + 14 )

h) 18 - 3 × ( - 7 ) + 9 × ( - 4 ) - 20​

Answer 1

Resposta:

a) = 81+(-80)

= 81 -80

= 1

b) = 28 - 30

= - 2

c) = - 26 -(-18)

= - 26 + 18

= - 5

d) = -54 - ( -54)

= - 54 + 54

= 0

e) = 19 - (- 20)

= 19 + 20

= 39

f) = - 21 + 54 - 22

= 11

g) = 55 - 37 + (28)

= 55 - 37 + 28

= 46

h) = 18 + 21 + (-36) - 20

= 18 + 21 - 36 - 20

= - 17