Question

выполнить действия
1/2-5/12=
1/8+7/12=
23/40-3/8=
9/35-3/28=
решите пожалуйста

Answer 1

1) $frac{1}{2}- frac{5}{12} = frac{1*6}{2*6} - frac{5}{12} = frac{6}{12} - frac{5}{12}= frac{6-5}{12}= frac{1}{12}$
2)$frac{1}{8}+ frac{7}{12}= frac{1*3}{8*3}+ frac{7*2}{12*2}= frac{3}{24}+ frac{14}{24}= frac{3+14}{24}= frac{17}{24}$
3)$frac{23}{40}- frac{3}{8}= frac{23}{40}- frac{3*5}{8*5}= frac{23}{40}- frac{15}{40}= frac{23-15}{40}= frac{8}{40}= frac{1*8}{5*8}= frac{1}{5}$
4)$frac{9}{35}-frac{3}{28}= frac{9*4}{35*4}- frac{3*5}{28*5}= frac{36}{140}- frac{15}{140} = frac{36-15}{140} = frac{21}{140} = frac{3*7}{20*7}= frac{3}{20}$