Question

найдите 1)4 / 5 часа часа 25 2)3 / 7 часть числа 42 3) 3/7 часть числа 120 4) 5/21 часть числа 84 5) 3/7 часть числа 7/15 6) 2/3 часть числа 9/28

Answer 1

$1)frac{4}{5}times25=frac{4}{5}timesfrac{25}{1}=frac{4times25}{5times1}=frac{4times5}{1}=frac{20}{1}=20$

$2)frac{3}{7}times42=frac{3}{7}timesfrac{42}{1}=frac{3times42}{7times1}=frac{3times6}{1}=frac{18}{1}=18$

$3)frac{3}{7}times120=frac{3}{7}timesfrac{120}{1}=frac{3times120}{7times1}=frac{360}{7}=51frac{3}{7}$

$4)frac{5}{21}times84=frac{5}{21}timesfrac{84}{1}=frac{5times84}{21times1}=frac{5times4}{1}=frac{20}{1}=20$

$5)frac{3}{7}timesfrac{7}{15}=frac{3times7}{7times15}=frac{1}{5}=0.2$

$6)frac{2}{3}timesfrac{9}{28}=frac{2times9}{3times28}=frac{3}{14}$