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

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