Giải các phương trình sau
Giải phương trình sau.
----- Nội dung ảnh -----
```
a) \frac{6-2x^2}{x^2-9} = \frac{3}{x+3} - \frac{2}{x-3} \cdot
b) \frac{1}{x-2} - \frac{1}{x^3-8} = \frac{2x^2}{x^2+2x+4} \cdot
c) \frac{1}{x^2+1} + \frac{1}{x^2+3x+2} + \frac{1}{x^2+5x+6} + \frac{1}{x^2+7x+12} = \frac{1}{3} \cdot
d) \frac{1}{x^2+2x-3} + \frac{18}{x^2+2x+2} = \frac{18}{x^2+2x+1} \cdot
e) \frac{x^2+1}{x} + \frac{3x}{x^2+x-5} + 4 = 0.
f) x^2 + \frac{4x^2}{(x+2)^2} = 5.
```
----- Nội dung ảnh -----
```
a) \frac{6-2x^2}{x^2-9} = \frac{3}{x+3} - \frac{2}{x-3} \cdot
b) \frac{1}{x-2} - \frac{1}{x^3-8} = \frac{2x^2}{x^2+2x+4} \cdot
c) \frac{1}{x^2+1} + \frac{1}{x^2+3x+2} + \frac{1}{x^2+5x+6} + \frac{1}{x^2+7x+12} = \frac{1}{3} \cdot
d) \frac{1}{x^2+2x-3} + \frac{18}{x^2+2x+2} = \frac{18}{x^2+2x+1} \cdot
e) \frac{x^2+1}{x} + \frac{3x}{x^2+x-5} + 4 = 0.
f) x^2 + \frac{4x^2}{(x+2)^2} = 5.
```