Tính giá trị biểu thức
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2. a) \(\frac{4x + 2}{4x - 4} + \frac{3 - 6x}{6x - 6}\);
c) \(\frac{x}{x - y} + \frac{y}{x + y} + \frac{2y^2}{x^2 - y^2}\);
3. a) \(\frac{1}{x - 2} - \frac{1}{x + 1}\);
c) \(\frac{1}{xy - x^2} - \frac{1}{y^2 - xy}\);
b) \(\frac{y}{2x^2 - xy} + \frac{y^2 - 2xy}{x^2 - 1}\);
d) \(\frac{12}{x^2 - 9} - \frac{2}{x - 3}\);
\(\frac{2x - 3}{x^2 - 1} + \frac{1}{2 + 2x} + \frac{1}{2 - 2x}\).
```
```
2. a) \(\frac{4x + 2}{4x - 4} + \frac{3 - 6x}{6x - 6}\);
c) \(\frac{x}{x - y} + \frac{y}{x + y} + \frac{2y^2}{x^2 - y^2}\);
3. a) \(\frac{1}{x - 2} - \frac{1}{x + 1}\);
c) \(\frac{1}{xy - x^2} - \frac{1}{y^2 - xy}\);
b) \(\frac{y}{2x^2 - xy} + \frac{y^2 - 2xy}{x^2 - 1}\);
d) \(\frac{12}{x^2 - 9} - \frac{2}{x - 3}\);
\(\frac{2x - 3}{x^2 - 1} + \frac{1}{2 + 2x} + \frac{1}{2 - 2x}\).
```