Question

Me ajudem pliss


1 – Efetue as expressões numéricas:

a) 2 + 4 – 2 =

b) 2 .{3 + 1. [5 – 4 . (3. 2)] – 8}=

c) – 2 + 6 – 10 – 4 =

d) 480 : { 20 . [ 86 - 12 . (5 + 2 ) ] 2 } =

e) 1440 : { 30 . [ 20 + ( 49 - 35 ) . 2 ] } =

2 – Efetue as multiplicações:

a) (+8) . (+5) =

b) (-3) . (+9) =

c) (+7) . (-10) =

d) (-2) .(-4) =

e) (-2) . (+3) . ( +4) =

f) (+5) . (-1) . (+2) =

3 – Efetue as divisões:

a) (– 15) : (– 3) =

b) (+ 20) : (+ 4) =

c) (- 50) : (+ 5) =

d) (+120) : (- 2) =​

Answer 1

1 –

a) 2 + 4 – 2 =

6-2=

4

b) 2 .{3 + 1. [5 – 4 . (3. 2)] – 8}=

2.{4.[ 1 . 6 ] -8}

2.{ 4 . 6 ] -8}

2.{ 24 - 8}

2.16

32

c) – 2 + 6 – 10 – 4 =

4-14

-10

d) 480 : { 20 . [ 86 - 12 . (5 + 2 ) ] 2 } =

480:{20 .[74 . 7] 2}

480:{20 . 518} 2}

480:{10360.2}

480:20720

0,023

e) 1440 : { 30 . [ 20 + ( 49 - 35 ) . 2 ] } =

1440 : {30 .[ 20 + 14 . 2 ] }

1440: {30 .[ 34 . 2 ] }

1440: {30 . 68 }

1440: 2040

0,705

2 –

a) (+8) . (+5) = 40

b) (-3) . (+9) = -27

c) (+7) . (-10) = -70

d) (-2) .(-4) = 8

e) (-2) . (+3) . ( +4) = (-6) . (+4) = -24

f) (+5) . (-1) . (+2) = (-5) . (+2) = -10

3 –

a) (– 15) : (– 3) = 5

b) (+ 20) : (+ 4) = 5

c) (- 50) : (+ 5) = -10

d) (+120) : (- 2) = -60