Tìm x, y biết

----- Nội dung ảnh -----
```
√(1 - 3x) / (2x) + (3x - 2) / (2x - 1) + (3x - 2) / (2x - 4x²)

y) (x² / (x + y)) + (y² / (y + z)) + (-z² / (x + y)) + (-z² / (y + z)) ;

J) A = (20x² + 120x + 180) / ((3x + 5)² - 4x²) + (5x² - 125) / (9x² - (2x + 5)²) - (1 / (3x² + 8x + 15)).
```