Question

Помогите решить пожалуйста

Answer 1

$1.ttdisplaystylefrac{21}{35}:frac{24}{60}=frac{21}{35}*frac{60}{24}=frac{21:7}{35:7}*frac{60:12}{24:12}=frac{3}{5}*frac{5}{2}=frac{3}{2}=1frac{1}{2}$

$2.(3ttdisplaystylefrac{11}{27}-2frac{17}{18}):1frac{23}{27}+3frac{3}{5}:3=1frac{9}{20}$

$1)3ttdisplaystylefrac{11}{27}-2frac{17}{18}=frac{3*27+11}{27}-frac{2*18+17}{18}=frac{92}{27}-frac{53}{18}=frac{92*2}{27*2}-frac{53*3}{18*3}=frac{184}{54}-frac{159}{54}=frac{25}{54}$

$2)ttdisplaystylefrac{25}{54}:1frac{23}{27}=frac{25}{54}:frac{50}{27}=frac{25}{54}*frac{27}{50}=frac{1}{4}$

$3)3ttdisplaystylefrac{3}{5}:3=frac{3*5+3}{5}:3=frac{18}{5}*frac{1}{3}=frac{6}{5}$

$4)ttdisplaystylefrac{1}{4}+frac{6}{5}=frac{1*5}{4*5}+frac{6*4}{5*4}=frac{5}{20}+frac{24}{20}=frac{29}{20}=1frac{9}{20}$