2. Сократите дробь: а) (3a + 3b)/(5(a + b)); б) (7x − 14y)/(3x − 6y); в) (5a − 20c)/(15ac); г) (x − 2b)/(x² − 2bx).

1. \(\dfrac{3a+3b}{5(a+b)}=\dfrac{3(a+b)}{5(a+b)}=\dfrac35\).
2. \(\dfrac{7x-14y}{3x-6y}=\dfrac{7(x-2y)}{3(x-2y)}=\dfrac73\).
3. \(\dfrac{5a-20c}{15ac}=\dfrac{5(a-4c)}{15ac}=\dfrac{a-4c}{3ac}\).
4. \(\dfrac{x-2b}{x^2-2bx}=\dfrac{x-2b}{x(x-2b)}=\dfrac1x\).

Ответ: а) \(\dfrac35\); б) \(\dfrac73\); в) \(\dfrac{a-4c}{3ac}\); г) \(\dfrac1x\).