слите: 3 +4+8 5 12 6' 1 1 5 ; г)6812' 2 3+518

в)

$$\frac{3}{4} + \frac{5}{8} = \frac{6}{8} + \frac{5}{8} = \frac{11}{8} = 1\frac{3}{8}$$.

Ответ: $$1\frac{3}{8}$$

д)

$$\frac{5}{12} - \frac{1}{6} = \frac{5}{12} - \frac{2}{12} = \frac{3}{12} = \frac{1}{4}$$.

Ответ: $$\frac{1}{4}$$

в)

$$\frac{5}{8} + \frac{1}{3} + \frac{7}{12} = \frac{15}{24} + \frac{8}{24} + \frac{14}{24} = \frac{37}{24} = 1\frac{13}{24}$$.

Ответ: $$1\frac{13}{24}$$

г)

$$\frac{5}{6} - \frac{1}{8} + \frac{5}{12} = \frac{20}{24} - \frac{3}{24} + \frac{10}{24} = \frac{27}{24} = \frac{9}{8} = 1\frac{1}{8}$$.

Ответ: $$1\frac{1}{8}$$

д)

$$3\frac{5}{7} + 4\frac{9}{14} - 2\frac{5}{21} = 3\frac{30}{42} + 4\frac{27}{42} - 2\frac{10}{42} = 5 + \frac{47}{42} = 5 + 1\frac{5}{42} = 6 \frac{5}{42}$$.

Ответ: $$6\frac{5}{42}$$

e)

$$2\frac{1}{3} + \frac{1}{5} - \frac{1}{8} = 2\frac{40}{120} + \frac{24}{120} - \frac{15}{120} = 2\frac{49}{120}$$.

Ответ: $$2\frac{49}{120}$$