Question

calcule o valor de x
a)30 =x
5 3

b)2/5=3/2
x 1,3

c)2x=6
15 9

d)0,5=x
2/6 5/9

Answer 1

Resposta:

Explicação passo-a-passo:

Calcule o valor de x

a)

30 =x

5 3

30/5 = x/3

6 = x/3

6.3 = x

18 = x

x = 18

_____________

b)2/5=3/2

x 1,3

2/5 ÷ x = 3/2 ÷ 1,3

2/5 . 1/x = 3/2 ÷ 13/10

2/5x = 3/2 . 10/13

2/5x = 3/13 . 10/2

2/5x = 3/13 . 5

2/5x = 15/13

2.13 = 5x.15

26 = 75x

75x = 26

x = 26/75

_____________

c)2x=6

15 9

2x/15 = 6/9 (:3)/(:3)

2x/15 = 2/3

2x.3 = 15.2

6x = 30

x = 30/6

x = 5

_____________

d)0,5=x

2/6 5/9

0,5 ÷ 2/6 = x ÷ 5/9

5/10 . 3 = x . 9/5

1/2 . 3 = 9x/5

3/2 = 9x/5

3.5 = 2.9x

15 = 18.x

18x = 15 (:3)

6x = 5

x = 5/6