4. Вычислите: 1) $\frac{5}{9}+\frac{4}{7}$; 2) $\frac{8}{9}-\frac{13}{18}$; 3) $\frac{11}{12}-\frac{9}{16}$; 4) $\frac{3}{8}+\frac{7}{10}$; 5) $\frac{9}{14}-\frac{12}{35}$; 6) $\frac{16}{21}-\frac{2}{9}+\frac{5}{7}$.

Question

Вопрос: $Фото задания: 4. Вычислите: 1) $\frac{5}{9}+\frac{4}{7}$; 2) $\frac{8}{9}-\frac{13}{18}$; 3) $\frac{11}{12}-\frac{9}{16}$; 4)…$ Фото задания

Accepted Answer

$\frac{5}{9}+\frac{4}{7}=\frac{35}{63}+\frac{36}{63}=\frac{71}{63}=1\frac{8}{63}$.
$\frac{8}{9}-\frac{13}{18}=\frac{16}{18}-\frac{13}{18}=\frac{3}{18}=\frac{1}{6}$.
$\frac{11}{12}-\frac{9}{16}=\frac{44}{48}-\frac{27}{48}=\frac{17}{48}$.
$\frac{3}{8}+\frac{7}{10}=\frac{15}{40}+\frac{28}{40}=\frac{43}{40}=1\frac{3}{40}$.
$\frac{9}{14}-\frac{12}{35}=\frac{45}{70}-\frac{24}{70}=\frac{21}{70}=\frac{3}{10}$.
$\frac{16}{21}-\frac{2}{9}+\frac{5}{7}=\frac{48}{63}-\frac{14}{63}+\frac{45}{63}=\frac{79}{63}=1\frac{16}{63}$.

Ответ: 1) $1\frac{8}{63}$; 2) $\frac{1}{6}$; 3) $\frac{17}{48}$; 4) $1\frac{3}{40}$; 5) $\frac{3}{10}$; 6) $1\frac{16}{63}$.

4. Вычислите: 1) \(\frac{5}{9}+\frac{4}{7}\); 2) \(\frac{8}{9}-\frac{13}{18}\); 3) \(\frac{11}{12}-\frac{9}{16}\); 4) \(\frac{3}{8}+\frac{7}{10}\); 5) \(\frac{9}{14}-\frac{12}{35}\); 6) \(\frac{16}{21}-\frac{2}{9}+\frac{5}{7}\).