Question

решите уравнение:
 1) 7 7/30-(5 11/30-у)=3 19/30

Answer 1

$7 frac{7}{30} -(5 frac{11}{30}-y)=3 frac{19}{30}$
$frac{15y+28}{15}= frac{109}{30}$ ⇒(15y+28)*30=15*109
$frac{(15y+28)*30}{30} = frac{15*109}{30}$
15y+28=$frac{15*109}{30}$
15y+28=1635/30
15y+28=54,5
15y=26,5
y=26,5:15
у=55/30
у=1 23/30