Question

Решить примеры по действиям

Answer 1

а)
$1)3 frac{11}{21}-2 frac{4}{15}=3 frac{11*5}{3*7*5}-2 frac{4*7}{3*5*7}= 3 frac{55}{105}-2 frac{28}{105}=1 frac{55-28}{105}= \ \ 1 frac{27}{105}=1 frac{9}{35} = frac{44}{35} \ \ 2)13.2: frac{44}{35}= frac{132}{10}* frac{35}{44}= frac{3*44}{2*5}* frac{5*7}{44}= frac{21}{2}=10.5 \ \ 3 ) 14-10.5=3.5$

б) 
$1)6 frac{11}{15}-4 frac{3}{20}= 6 frac{11*4}{15*4}-4 frac{3*3}{20*3}=6 frac{44}{60}-4 frac{9}{60}=2 frac{44-9}{60}=2 frac{35}{60}=2 frac{7}{12}= frac{31}{12} \ \ 2)18.6: frac{31}{12}= frac{186}{10}* frac{12}{31}= frac{6*31}{10}* frac{12}{31}=72 \ \ 3)20-72=-52$