Question

Номер 425 помогите пожалуйста дам 20 баллов и больше ​

Answer 1

$1) \frac{1}{3} - \frac{1}{9} = \frac{1*3}{3*3} - \frac{1}{9} = \frac{3}{9} - \frac{1}{9} = \frac{2}{9}$

$2) \frac{10}{21} - \frac{1}{3} = \frac{10}{21} - \frac{1*7}{3*7} = \frac{10}{21} - \frac{7}{21} = \frac{3}{21} = \frac{1}{7}$

$3) \frac{14}{15} - \frac{3}{5} = \frac{14}{15} - \frac{3*3}{5*3} = \frac{14}{15} - \frac{9}{15} = \frac{5}{15} = \frac{1}{3}$

$4) \frac{17}{18} - \frac{1}{9} = \frac{17}{18} - \frac{1*2}{9*2} = \frac{17}{18} - \frac{2}{18} = \frac{15}{18} = \frac{5}{6}$

$5) \frac{4}{9} - \frac{13}{45} = \frac{4*5}{9*5} - \frac{13}{45} = \frac{20}{45} - \frac{13}{45} = \frac{7}{45}$

$6) \frac{1}{3} - \frac{7}{30} = \frac{1*10}{3*10} - \frac{7}{30} = \frac{10}{30} - \frac{7}{30} = \frac{3}{30} = \frac{1}{10}$