Question

alguem pode me ajudar nesses exercícios? emcomtre o valor de "x"?

Answer 1

D) 40/15 = 80/(x + 1)

40 . (x + 1) = 80 . 15

40x + 40 = 1200

40x = 1200 – 40

40x = 1160

x = 1160/40

x = 29

 

E) (x – 3)/2 = 5/4

4 . (x – 3) = 5 . 2

4x – 12 = 10

4x = 10 + 12

4x = 22

x = 22/4

x = 11/2

 

F) 2x/6 = 4/18

2x . 18 = 6 . 4

36x = 24

x = 24/36

x = 2/3

 

G) 4/(x + 6) = 1/8

4 . 8 = 1 . (x + 6)

32 = x + 6

x = 32 – 6

x = 26

 

H) (40 – 2x)/3 = 1/3

3 . (40 – 2x) = 3 . 1

120 – 6x = 3

6x = 120 – 3

6x = 117

x = 117/6

x = 39/2

 

I) (3x + 2)/10 = (x + 1)/2

2 . (3x + 2) = 10 . (x + 1)

6x + 4 = 10x + 10

10x – 6x = 4 – 10

4x = – 6

x = – 6/4

x = – 3/2

 

Bons estudos!