№2 Решите уравнения: a) x +$$\frac{3}{7}$$+$$\frac{4}{5}$$=4$$\frac{2}{5}$$ б) x + 8$$\frac{3}{4}$$= 11$$\frac{1}{2}$$

a) x +$$\frac{3}{7}$$+$$\frac{4}{5}$$=4$$\frac{2}{5}$$

x = $$\frac{22}{5}$$ - $$\frac{3}{7}$$ - $$\frac{4}{5}$$

x = $$\frac{22}{5}$$ - $$\frac{4}{5}$$ - $$\frac{3}{7}$$

x = $$\frac{18}{5}$$ - $$\frac{3}{7}$$

x = $$\frac{18 \cdot 7 - 3 \cdot 5}{35}$$

x = $$\frac{126 - 15}{35}$$

x = $$\frac{111}{35}$$ = 3$$\frac{6}{35}$$

б) x + 8$$\frac{3}{4}$$= 11$$\frac{1}{2}$$

x = 11$$\frac{1}{2}$$ - 8$$\frac{3}{4}$$

x = 11$$\frac{2}{4}$$ - 8$$\frac{3}{4}$$

x = 10$$\frac{6}{4}$$ - 8$$\frac{3}{4}$$

x = 2$$\frac{3}{4}$$

Ответ: а) 3$$\frac{6}{35}$$, б) 2$$\frac{3}{4}$$