Question

Номера 8 и 9 под буквами б,г

Answer 1

$(12 frac{2}{5}-6 frac{1}{5} ):7 frac{3}{4} = frac{4}{5}$
$12 frac{2}{5}-6 frac{1}{5}=6 frac{1}{5}= frac{31}{5}$
$frac{31}{5}:7 frac{3}{4}= frac{31}{5}: frac{4}{31}= frac{4}{5}$

$2 frac{1}{3}* frac{6}{7}-2 frac{1}{4}:5 frac{3}{4}= frac{14}{23}$
$2 frac{1}{3}* frac{6}{7}= frac{7}{3}* frac{6}{7}= frac{6}{3} =2$
$2 frac{1}{4}:5 frac{3}{4}= frac{9}{4}* frac{4}{23}= frac{9}{23}$
$2- frac{9}{23}= frac{46-9}{23} = frac{37}{23}=1 frac{14}{23}$