Question

Nas figuras, a//b//c, calcule o valor de x

Answer 1

a) 2/4 = 3/x
multiplica em cruz
2x = 12
x = 12/2
x = 6

b) 4/12 = x/21
12x = 84
x= 84/12
x = 7

d) x/9 = 8/12
12x = 72
x = 72/12
x = 6

e) 9/x = 18/4
18x = 36
x = 36/18
x = 2

f) 10/15 = 3x + 1 / 5x - 2
15 (3x + 1) = 10 (5x - 2)
45x + 15 = 50x - 20
45x - 50x = - 20 - 15
- 5x = - 35 ( - 1 )
5x = 35
x = 35/5
x = 7


 

Answer 2

Resposta:a) 2/4 = 3/x

multiplica em cruz

2x = 12

x = 12/2

x = 6

b) 4/12 = x/21

12x = 84

x= 84/12

x = 7

d) x/9 = 8/12

12x = 72

x = 72/12

x = 6

e) 9/x = 18/4

18x = 36

x = 36/18

x = 2

f) 10/15 = 3x + 1 / 5x - 2

15 (3x + 1) = 10 (5x - 2)

45x + 15 = 50x - 20

45x - 50x = - 20 - 15

- 5x = - 35 ( - 1 )

5x = 35

x = 35/5

x = 7

ESPERO TER AJUDADO!!!!