Question

Помогите.Не могу решить!Дам 17 баллов!
5 4/19*3 4/7+1 15/19:7/25-1 2/3

Answer 1

$5 frac{4}{19} * 3 frac{4}{7} + 1 frac{15}{19} : frac{7}{25} - 1 frac{2}{3} =10 frac{220}{399} \ \ 1) 5 frac{4}{19} * 3 frac{4}{7} = frac{5*19+4}{19} * frac{3*7+4}{7} = frac{99*25}{19*7} = frac{2475}{133} =18 frac{81}{133} \ \ 2) 1 frac{15}{19} : frac{7}{25}= frac{1*15+19}{19} * frac{25}{7} = frac{34*25}{19*7} = frac{850}{133} = 6 frac{52}{133} \ \ 3) 18 frac{81}{133}-6 frac{52}{133} = (18-6) + frac{81-52}{133} = 12 frac{29}{133}$
$4) 12 frac{29}{133} - 1 frac{2}{3} = 12 frac{87}{399} - 1 frac{266}{399} = 10 frac{220}{399}$