че уравнение: 3 4 11-x=86)x+2= 19

а) $$\frac{3}{11}-x = 3\frac{3}{11}$$

$$ -x = 3\frac{3}{11} - \frac{3}{11}$$

$$ -x = \frac{3\cdot 11+3}{11} - \frac{3}{11}$$

$$ -x = \frac{33+3}{11} - \frac{3}{11}$$

$$ -x = \frac{36}{11} - \frac{3}{11}$$

$$ -x = \frac{36-3}{11}$$

$$ -x = \frac{33}{11}$$

$$ -x = 3$$

$$ x = -3$$

б) $$x + 2\frac{4}{13} = 10\frac{2}{13}$$

$$x = 10\frac{2}{13} - 2\frac{4}{13}$$

$$x = 10 - 2 + \frac{2}{13} - \frac{4}{13}$$

$$x = 8 + \frac{2}{13} - \frac{4}{13}$$

$$x = 7 + \frac{13}{13} + \frac{2}{13} - \frac{4}{13}$$

$$x = 7 + \frac{13+2}{13} - \frac{4}{13}$$

$$x = 7 + \frac{15}{13} - \frac{4}{13}$$

$$x = 7 + \frac{15-4}{13}$$

$$x = 7 + \frac{11}{13}$$

$$x = 7\frac{11}{13}$$

Ответ: а) -3, б) $$7\frac{11}{13}$$