Вычислите : (3/4+1/5)*5/19

[latex]( frac{3}{4} + frac{1}{5} )* frac{5}{19}=0.25 \ 1) frac{3}{4} + frac{1}{5} = frac{3*5}{4*5} + frac{1*4}{5*4} = frac{15}{20} + frac{4}{20} = frac{19}{20} \ 2) frac{19}{20} * frac{5}{19} = frac{19*5}{20*19} = frac{1}{4} =0.25[/latex]