Question

Вычислите: 1) 21/40 : 3/4 2) 1 5/9 : 1 8/27 3) 5 : 15/16 4) 9/17 : 3

с решением - пример- ( 21/40:3/4= 21/40*4/3= 84/120, сокращаем= 7/10 )

Answer 1

$1)frac{21}{40}:frac{3}{4}=frac{21}{40}*frac{4}{3}=frac{7}{10}  \\ 2) 1frac{5}{9}:1frac{8}{27}=frac{14}{9}:frac{35}{27}=frac{14}{9}*frac{27}{35}=frac{7*2}{9}*frac{9*3}{7*5}=frac{6}{5}=1,2\\ 3)5:frac{15}{16}=5*frac{16}{15}=frac{5*16}{5*3}=frac{16}{3}=5frac{1}{3}\\ 4)frac{9}{17}:3=frac{3*3}{17*3}=frac{3}{17}$