Question

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

Answer 1

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

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

$(ttdisplaystylefrac{8}{9}-frac{5}{6})+frac{2}{3}=(frac{8*2-5*3}{18})+frac{2}{3}=frac{1}{18}+frac{2*6}{3*6}=frac{1+12}{18}=frac{13}{18}$