уравнения: а) 2 1/3x = 3,6 · 7/18 ; б) 1 2/13(3/7x - 5/6) = 2,5.

Решим уравнения:

а) 2$$\frac{1}{3}$$x = 3,6 · $$\frac{7}{18}$$

$$\frac{7}{3}$$x = $$\frac{36}{10}$$ · $$\frac{7}{18}$$

$$\frac{7}{3}$$x = $$\frac{2 \cdot 7}{10}$$

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

x = $$\frac{7}{5}$$ : $$\frac{7}{3}$$

x = $$\frac{7}{5}$$ * $$\frac{3}{7}$$

x = $$\frac{3}{5}$$

x = 0,6

б) 1$$\frac{2}{13}$$($$\frac{3}{7}$$x - $$\frac{5}{6}$$) = 2,5

$$\frac{15}{13}$$($$\frac{3}{7}$$x - $$\frac{5}{6}$$) = $$\frac{5}{2}$$

$$\frac{3}{7}$$x - $$\frac{5}{6}$$ = $$\frac{5}{2}$$ : $$\frac{15}{13}$$

$$\frac{3}{7}$$x - $$\frac{5}{6}$$ = $$\frac{5}{2}$$ * $$\frac{13}{15}$$

$$\frac{3}{7}$$x - $$\frac{5}{6}$$ = $$\frac{13}{6}$$

$$\frac{3}{7}$$x = $$\frac{13}{6}$$ + $$\frac{5}{6}$$

$$\frac{3}{7}$$x = $$\frac{18}{6}$$

$$\frac{3}{7}$$x = 3

x = 3 : $$\frac{3}{7}$$

x = 3 * $$\frac{7}{3}$$

x = 7

Ответ: а) x = 0,6; б) x = 7.