Question

1)calcule o valor de cada uma das seguintes expressoes numericas

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

queror a conta

Answer 1

Olá, vamos lá!

$a)\\ \\81 + (-20) . (+4)\\81 +(-80)\\\boxed{1}\\ \\b) \\ \\(-4) . (-7) -30\\28 -30\\\boxed{-2}\\ \\c)\\ \\-23 - (-6) . (+3)\\-23-(-18)\\-23+18\\\boxed{-5}\\ \\d)\\ \\(-9) . (+6) - (+2) . (-27)\\-54-(-54)\\-54+54\\\boxed {0}\\ \\e)\\ \\19 - (-4) . (+5)\\19-(-20)\\19+20\\\boxed {39}\\ \\f)\\ \\7. (-3) -9 . (-6) +11 . (-2)\\-21-(-54)+(-22)\\-21+54-22\\33-22\\\boxed {11}$
$g)\\ \\(+5) . (+11) -37-(-2) . (+14)\\55-37-(-28)\\55-37+28\\18+28\\\boxed {46}\\ \\h)\\ \\18 - 3 (-7) +9 . (-4) -20\\18-3(-7)+(-36)-20\\18-(-21)-36-20\\18+21-36-20\\39-36-20\\3-20\\\boxed {-17}$

qualquer dúvida comente ;)
$\boxed {Bons\ estudos!}$

Answer 2

Resposta:

a) 81 + (-20· (+4)

81 + (-80)

81 - 80 = 1

B) (-4).(-7) - 30

28 - 30 = -2

C) -23 - (-6) (43)

-23 + 6 x 43

-23 + 258 = 235

D) (-9).(+6) - (+2).(-27)

-54 - 2 x (-27)

-54 + 54  = 0

E) 19 - (-4). (+5)

-(19 x 4 x 5)

-( 19 x 20 )

-380

F) 7.(-3) - 9.(-6) 11.(-2)

-21 - 1188 = -1209

G) (+5).(+11) - 37 - (-2).(+14)

55 - 37 + 2 x 14

55 - 37 + 28 = 46

H) 18 - 3.(-7) +9.(-4)-20

18 + 21 - 36 - 20 = -17