9. Вычислите: 1) $\frac{3}{20}+\frac{2}{15}$; 2) $\frac{17}{32}-\frac{5}{12}$; 3) $\frac{11}{28}+\frac{9}{14}$; 4) $\frac{35}{36}-\frac{41}{45}$; 5) $3\frac{21}{25}+1\frac{2}{5}$; 6) $4\frac{13}{16}-2\frac{3}{8}$; 7) $5\frac{5}{6}-\frac{31}{48}$; 8) $6\frac{4}{7}-2\frac{37}{77}$.

Question

9. Вычислите: 1) $\frac{3}{20}+\frac{2}{15}$; 2) $\frac{17}{32}-\frac{5}{12}$; 3) $\frac{11}{28}+\frac{9}{14}$; 4) $\frac{35}{36}-\frac{41}{45}$; 5) $3\frac{21}{25}+1\frac{2}{5}$; 6) $4\frac{13}{16}-2\frac{3}{8}$; 7) $5\frac{5}{6}-\frac{31}{48}$; 8) $6\frac{4}{7}-2\frac{37}{77}$.

$Фото задания: 9. Вычислите: 1) $\frac{3}{20}+\frac{2}{15}$; 2) $\frac{17}{32}-\frac{5}{12}$; 3) $\frac{11}{28}+\frac{9}{14}$; 4)…$ Фото задания

Accepted Answer

$\frac{3}{20}+\frac{2}{15}=\frac{9}{60}+\frac{8}{60}=\frac{17}{60}$.
$\frac{17}{32}-\frac{5}{12}=\frac{51}{96}-\frac{40}{96}=\frac{11}{96}$.
$\frac{11}{28}+\frac{9}{14}=\frac{11}{28}+\frac{18}{28}=\frac{29}{28}=1\frac{1}{28}$.
$\frac{35}{36}-\frac{41}{45}=\frac{175}{180}-\frac{164}{180}=\frac{11}{180}$.
$3\frac{21}{25}+1\frac{2}{5}=3\frac{21}{25}+1\frac{10}{25}=4\frac{31}{25}=5\frac{6}{25}$.
$4\frac{13}{16}-2\frac{3}{8}=4\frac{13}{16}-2\frac{6}{16}=2\frac{7}{16}$.
$5\frac{5}{6}-\frac{31}{48}=5\frac{40}{48}-\frac{31}{48}=5\frac{9}{48}=5\frac{3}{16}$.
$6\frac{4}{7}-2\frac{37}{77}=6\frac{44}{77}-2\frac{37}{77}=4\frac{7}{77}=4\frac{1}{11}$.

Ответ: 1) $\frac{17}{60}$; 2) $\frac{11}{96}$; 3) $1\frac{1}{28}$; 4) $\frac{11}{180}$; 5) $5\frac{6}{25}$; 6) $2\frac{7}{16}$; 7) $5\frac{3}{16}$; 8) $4\frac{1}{11}$.