Сокращение дробей

1. а) $$\frac{14x^4y}{49x^3y^2} = \frac{2x}{7y}$$
2. б) $$\frac{5x}{x^2+3x} = \frac{5x}{x(x+3)} = \frac{5}{x+3}$$
3. в) $$\frac{x^2-y^2}{2x-2y} = \frac{(x-y)(x+y)}{2(x-y)} = \frac{x+y}{2}$$
4. г) $$\frac{x^2-16}{x^2-8x+16} = \frac{(x-4)(x+4)}{(x-4)^2} = \frac{x+4}{x-4}$$