3. Решите уравнения: а) х + 2$$\frac{3}{15}$$ = 5$$\frac{9}{20}$$ б) у$$\cdot$$3$$\frac{4}{5}$$ = 2$$\frac{1}{9}$$

3.

a) х + 2$$\frac{3}{15}$$ = 5$$\frac{9}{20}$$

x + $$\frac{33}{15}$$ = $$\frac{109}{20}$$

x = $$\frac{109}{20}$$ - $$\frac{33}{15}$$

x = $$\frac{109 \cdot 3}{20 \cdot 3}$$ - $$\frac{33 \cdot 4}{15 \cdot 4}$$

x = $$\frac{327}{60}$$ - $$\frac{132}{60}$$

x = $$\frac{195}{60}$$ = $$\frac{13}{4}$$ = 3$$\frac{1}{4}$$

Ответ: 3$$\frac{1}{4}$$

б) у$$\cdot$$3$$\frac{4}{5}$$ = 2$$\frac{1}{9}$$

у$$\cdot$$\frac{19}{5}$$ = $$\frac{19}{9}$$

y = $$\frac{19}{9}$$ : $$\frac{19}{5}$$

y = $$\frac{19}{9}$$\cdot$$\frac{5}{19}$$ = $$\frac{5}{9}$$

Ответ: $$\frac{5}{9}$$