Question

Помогите решить примеры
(желательно подробно)

3/5+6/7
5/6+1/4
7/8-5/6
3/10-4/15​

Answer 1

$\frac{3}{5}+\frac{6}{7}= \frac{3*7}{5*7}+\frac{6*5}{7*5}=\frac{21}{35}+\frac{30}{35}=\frac{51}{35}=1\frac{16}{35}$

$\frac{5}{6}+\frac{1}{4}= \frac{5*2}{6*2}+\frac{1*3}{4*3}=\frac{10}{12}+\frac{3}{12}=\frac{13}{12}=1\frac{1}{12}$

$\frac{7}{8}-\frac{5}{6}= \frac{7*3}{8*3}-\frac{5*4}{6*4}=\frac{21}{24}-\frac{20}{24}=\frac{1}{24}$

$\frac{3}{10}-\frac{4}{15}=\frac{3*3}{10*3}-\frac{4*2}{15*2}=\frac{9}{30}-\frac{8}{30}=\frac{1}{30}$