Question

Вычислите: 1)12/35:2/5 2)15/17:5 3)4:20/21 4)8целых3/4:2целых1/3

Answer 1

$1) frac{12}{35}:frac{2}{5} =frac{12}{35} *frac{5}{2} =frac{12*5}{35*2} =frac{6}{7}$

$2) frac{15}{17} :5=frac{15}{17}*frac{1}{5} =frac{15*1}{17*5} =frac{3}{17}$

$3)4:frac{20}{21} =4*frac{21}{20}=frac{4*21}{20} = frac{21}{5} =4frac{1}{5} =4,2$

$4)8frac{3}{4}:2frac{1}{3} =frac{35}{4}:frac{7}{3} =frac{35}{4} *frac{3}{7} =frac{5*3}{4}=frac{15}{4}=3frac{3}{4}$$=3,75$