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

1) [latex] 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} [/latex]2)[latex] 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} [/latex]3)[latex] 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} [/latex]4)[latex] 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} [/latex]