Question

Aflați:
120/a = 0,(15)
a=?

Answer 1

120/a=0, (15)
120/a=15/99
a= 120/1 :15/99
a=120/1 ×99/15
a=8×99 totul supra /1×1
a=792/1
a=792

Probă

120/792=0, (15) adevarat

Answer 2

$\frac{120}{a} = \frac{15}{99}$
$\frac{120}{a} = \frac{5}{33}$
$5a = 120 \times 33$
5a=3960
$a = \frac{3960}{5}$
a=792