Question

Resolva a equaçao

a.
$\frac{x}{3} + \frac{x}{2} = 15$
b.
$\frac{2x}{6} + \frac{3x}{6} = \frac{90}{6}$
​

Answer 1

Resposta:

a. x = 18

b. x = 18

Explicação passo-a-passo:

a.

x / 3

= ( x / 3 ) x ( 2 / 2 )

= 2x / 6

x / 2

= ( x / 2 ) x ( 3 / 3 )

= 3x / 6

x / 3 + x / 2 = 15

2x / 6 + 3x / 6 = 15

( 2x + 3x ) / 6 = 15

5x / 6 = 15

5x = 15 * 6

5x = 90

x = 90 / 5

x = 18

b.

2x / 6 + 3x / 6 = 90 / 6

( 2x + 3x ) / 6 = 90 / 6

2x + 3x = 90

5x = 90

x = 90 / 5

x = 18