Сократите дробь:

• 1) $$rac{24a^4b^4}{16a^2b^7} = \frac{3a^2}{2b^3}$$
• 2) $$\frac{15x-10xy}{5xy} = \frac{5x(3-2y)}{5xy} = \frac{3-2y}{y}$$
• 3) $$\frac{m^2-4}{2m-4} = \frac{(m-2)(m+2)}{2(m-2)} = \frac{m+2}{2}$$
• 4) $$\frac{25-a^2}{a^2-10a+25} = \frac{(5-a)(5+a)}{(a-5)^2} = \frac{-(a-5)(5+a)}{(a-5)(a-5)} = -\frac{5+a}{a-5}$$