Question

Помогите срочно .Номер 1090 1,2,3

Answer 1

1) $( frac{3}{4} + frac{1}{20} )* frac{1}{2}= ( frac{15}{20} + frac{1}{20} )* frac{1}{2}= frac{16}{20}* frac{1}{2}= frac{8}{20} = frac{2}{5}$

2)$( frac{7}{12} - frac{1}{3} )* frac{16}{19} =( frac{7}{12} - frac{4}{12} )* frac{16}{19} = frac{3}{12}* frac{16}{19} = frac{1}{4}* frac{16}{19} = frac{4}{19}$

3) $(7 frac{3}{5} - 2frac{4}{15} )* frac{9}{32} =( frac{38}{5} - frac{34}{15} )* frac{9}{32} =( frac{114}{15} - frac{34}{15} )* frac{9}{32} =frac{80}{15} * frac{9}{32} =$
$= frac{16}{3} * frac{9}{32} = frac{3}{2}$