5. Решите уравнение: a) 5-1+2=2 4 52x=2

а)

Решаем уравнение:

\[5\frac{3}{4} - \left(1\frac{1}{5} + 2x\right) = 2\frac{17}{20}\]

\[\frac{23}{4} - \left(\frac{6}{5} + 2x\right) = \frac{57}{20}\]

\[\frac{6}{5} + 2x = \frac{23}{4} - \frac{57}{20}\]

\[\frac{6}{5} + 2x = \frac{23 \cdot 5 - 57}{20} = \frac{115 - 57}{20} = \frac{58}{20} = \frac{29}{10}\]

\[2x = \frac{29}{10} - \frac{6}{5} = \frac{29 - 12}{10} = \frac{17}{10}\]

\[x = \frac{17}{20}\]

Ответ: \[x = \frac{17}{20}\]