Сокращение дробей

1. • а) $$rac{5m}{7m} = \frac{5}{7}$$
   • б) $$rac{3a}{3q} = \frac{a}{q}$$
2. • а) $$rac{p^2+pc}{pb} = \frac{p(p+c)}{pb} = \frac{p+c}{b}$$
   • б) $$rac{p^2-pc}{p^2+2pc} = \frac{p(p-c)}{p(p+2c)} = \frac{p-c}{p+2c}$$
3. • а) $$rac{a^2}{a^2+3a} = \frac{a \cdot a}{a(a+3)} = \frac{a}{a+3}$$
   • б) $$rac{a^2+3a}{a^2-9} = \frac{a(a+3)}{(a-3)(a+3)} = \frac{a}{a-3}$$
4. • а) $$rac{x}{xy} = \frac{1}{y}$$
   • б) $$rac{x-2y}{x^2-4y^2} = \frac{x-2y}{(x-2y)(x+2y)} = \frac{1}{x+2y}$$