Question

решите уравнение 11·t-3,9=71

Answer 1

$11t-3,9=71$
$11t=71+3.9$
$11t=74.9$
$t=74.9:11$
$t=74 frac{9}{10} :11= frac{749}{10} * frac{1}{11} =6 frac{89}{110}$ 

Answer 2

11t-3.9=71
11t=71+3.9
11t=74.9
t=74.9/11
t=749/10 * 1/11
t=749/110
t=6  89/110