Question

a) x = 21
5 35


b) 10 = 50

7 x


c) 1 = x-6

7 49



e) 5x+3 = - 21

10 30



Resolva as proporçoes

Answer 1

Resposta:

regra de 3

...

A)

x = 21

5 = 35 ............... multiplique cruzado

...

35x = 21 . 5

35x = 105

x = 105/35

x = 3

...

b)

10 = 50

7 =   x

...

10x = 7 x 50

10x = 350

x = 350/10

x = 35

...

c)

1 = x-6  

7 = 49

...7 (x -6) = 1 . 49

7x - 42 = 49

7x = 49 + 42

7x = 91

x = 91/7

x = 13

...

e)

5x+3 = - 21

10  =   30

...

30(5x +3) = -21 . 10

150x + 90 = -210

150x = -210 -90

150x = -300

x = -300/150

x = -2

Explicação passo-a-passo: