Question

выполните действия (7/15-1/6)+2/5 (3/8-1/9)+25/36

Answer 1

$(ttdisplaystylefrac{7}{15}-frac{1}{6})+frac{2}{5}=(frac{7*2}{15*2}-frac{1*5}{6*5})+frac{2}{5}=(frac{14}{30}-frac{5}{30})+frac{2}{5}=frac{9}{30}+frac{2}{5}=frac{3}{10}+frac{4}{10}=frac{7}{10}=0,7$

$(ttdisplaystylefrac{3}{8}-frac{1}{9})+frac{25}{36}=(frac{3*9}{8*9}-frac{1*8}{9*8})+frac{25}{36}=(frac{27}{72}-frac{8}{72})+frac{25*2}{36*2}=frac{19}{72}+frac{50}{72}=frac{69}{72}=frac{23}{24}$