1) Найдите значение выражения (2/5 + 13/15) ⋅ 6.
2) Найдите значение выражения (9/10 − 7/15) ⋅ 3.
3) Найдите значение выражения (3/4 − 1/6) ⋅ 3.
4) Найдите значение выражения (1/5 + 8/15) ⋅ 6.
5) Найдите значение выражения (3/8 − 1/20) ⋅ 10.
6) Найдите значение выражения (5/6 + 7/15) ⋅ 3.
7) Найдите значение выражения (1/30 + 3/20) ⋅ 6.

1) \(\left(\frac{2}{5}+\frac{13}{15}\right)\cdot6=\left(\frac{6}{15}+\frac{13}{15}\right)\cdot6=\frac{19}{15}\cdot6=\frac{38}{5}=7\frac{3}{5}\).

2) \(\left(\frac{9}{10}-\frac{7}{15}\right)\cdot3=\left(\frac{27}{30}-\frac{14}{30}\right)\cdot3=\frac{13}{30}\cdot3=\frac{13}{10}=1\frac{3}{10}\).

3) \(\left(\frac{3}{4}-\frac{1}{6}\right)\cdot3=\left(\frac{9}{12}-\frac{2}{12}\right)\cdot3=\frac{7}{12}\cdot3=\frac{7}{4}=1\frac{3}{4}\).

4) \(\left(\frac{1}{5}+\frac{8}{15}\right)\cdot6=\left(\frac{3}{15}+\frac{8}{15}\right)\cdot6=\frac{11}{15}\cdot6=\frac{22}{5}=4\frac{2}{5}\).

5) \(\left(\frac{3}{8}-\frac{1}{20}\right)\cdot10=\left(\frac{15}{40}-\frac{2}{40}\right)\cdot10=\frac{13}{40}\cdot10=\frac{13}{4}=3\frac{1}{4}\).

6) \(\left(\frac{5}{6}+\frac{7}{15}\right)\cdot3=\left(\frac{25}{30}+\frac{14}{30}\right)\cdot3=\frac{39}{30}\cdot3=\frac{39}{10}=3\frac{9}{10}\).

7) \(\left(\frac{1}{30}+\frac{3}{20}\right)\cdot6=\left(\frac{2}{60}+\frac{9}{60}\right)\cdot6=\frac{11}{60}\cdot6=\frac{11}{10}=1\frac{1}{10}\).

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