Question

Alguns de vcs teriam as respostas desse trabalho?
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Answer 1

Resposta:

Explicação passo-a-passo:

1)

A)

3-2-5 = 1-5= - 4

B)

-2-1-5 = -3-5= - 8

C)

4-6-7+6+7 = 4-6+6-7+7= 4

D)

-3+5-6+8+4 = 2- 6 + 12 = - 4 + 12 = 8

2)

A)

= 4-9+1

= 4-8

= - 4

B)

= 3.25 - (-5) + 7.1

= 75+5+7

= 87

C)

= -1 -(-1)+7.1

= -1+1+7

= 7

D)

= 32-16 - (-8) - 4

= 16 + 8 - 4

= 16 + 4

= 20

3)

A)

5/3 + 2/3 - 1/3 = 7/3-1/3= 6/3

= 2

___________

B)

= -2 + 1/2 - 1/8

= [8.(-2) + 4.1 - 1]/8

= [-16+4-1]/8

= - 13/8

________

C)

= -3/5 . 7/4

= -21/20

________

D)

= (1+1/3): (2 - 3/2)

= (3.1+1)/3 : (2-1,5)

= 4/3 : 0,5

= 4/3 : 1/2

= 4/3 . 2/1

= 8/3

________

4)

(3.48 + 2.32)/5 = (144+64)/5 = 208/5

= 41,6 anos

5)

(1,8-5,6)/2 = - 3,8/2

= - 1,9° C

6)

(3.21 + 2.12)/5 = (63+24)/5 = 87/5

= 17,40

7)

15/10+27/20+36/30 = (1,5+1,35+1,2)/3 = (2,70+1,35)/3= 4,05/3 = 1,35

8. Equação literal (leitura e interpretação)

A)2x

B) x/3

C) x+ 8

D) x - 5

E) 3x

F) x - 3

G) 4.x

H) x + 7

I) 2.(x+9)

J) x - 5

9)

A)

7a+7a - 6a

= 14a - 6a

= 8a

B)

8xy + 4xy - 4xy - 5xy

= 8xy - 3xy

= 5xy

C)

2x + 3y - 1 - 3y + x

= 3x - 1

10)

X^2 - 4x + 3

X = 3

3^2 - 4.3 + 3 = 9-12+3 = 12-12 = 0

11)

A)

3x-3= x + 11

3x - x = 11+3

2x = 14

X = 14/2

X = 7

B)

27x - 9 - 5 = 6x

27x - 14 = 6x

27x - 6x = 14

21x = 14 (:7)

3x = 2

X = 2/3

C)

X - 6 + 4x = 0

5x = 6

X = 6/5

D)

8x = 6x - 2 - 16

8x - 6x = - 18

2x = - 18

X = - 18/2

X = - 9

E)

2x- 6 = - 5x - 20

2x+ 5x = - 20 + 6

7x = - 14

X = - 14/7

X= - 2

F)

3x - 15 + 7x = 15 - 5x

10x - 15 = 5 - 5x

10x + 5x = 5+15

15.x = 20 (:5)

3x = 4

X = 4/3

G)

5 - 4x - 4 = 4x - 12x + 3 - 4

1 - 4x = - 8x - 1

8x - 4x = - 1 - 1

4x = - 2 (:2)

2x = - 1

X = -1/2

H)

6x - 11 = 5x - 3

6x - 5x = - 3 + 11

X = 8

I)

8x - 5 = - 2x + 1

8x + 2x = 1+5

10x = 6 (:2)

5x = 3

X = 3/5