Ответ:

2) [tex]\frac{x - xy}{y}[/tex]

4) [tex]\frac{ab + ab - ab}{b}[/tex]

6) [tex]\frac{ax^{2} - bx - a}{x^{2}}[/tex]

Объяснение:

2) [tex]\frac{x}{y} - x = \frac{x}{y} - \frac{xy}{y} = \frac{x - xy}{y}[/tex]

4) [tex]a + a - \frac{ab}{b} = \frac{ab}{b} + \frac{ab}{b} - \frac{ab}{b} = \frac{ab + ab - ab}{b}[/tex]

6) [tex]a - \frac{b}{x} - \frac{a}{x^{2}} = \frac{ax^{2} }{x^{2}} - \frac{bx}{x^{2}} - \frac{a}{x^{2}} = \frac{ax^{2} - bx - a}{x^{2}}[/tex]