Question

Calculati x/12=1/3+1/4/7

Answer 1

x/12 = 1/3 + 1/4/7

x/12 = 1/3 + 7/4 = 4/12 + 21/12 = 25/12

deci x = 25

Answer 2

$\frac{x}{12} = \frac{1}{ 3} + \frac{1}{ \frac{4}{7} }$
$\frac{x}{12} = \frac{1}{3} + \frac{1}{4} \times \frac{1}{7}$
$\frac{x}{12} = \frac{1}{3} + \frac{1}{28}$
Aducem la același numitor comun care: 84

$7x = 28 + 3$
$x = \frac{31}{7}$