Вариант 3. 1. Сократите дробь: a) $$rac{22p^2q^2}{99p^3q}$$; б) $$rac{7a}{a^2+5a}$$; в) $$rac{x^2-y^2}{4x+4y}$$

a) $$rac{22p^2q^2}{99p^3q} = rac{2 \cdot 11 \cdot p^2 \cdot q^2}{9 \cdot 11 \cdot p^3 \cdot q} = rac{2q}{9p}$$ б) $$rac{7a}{a^2+5a} = rac{7a}{a(a+5)} = rac{7}{a+5}$$ в) $$rac{x^2-y^2}{4x+4y} = rac{(x-y)(x+y)}{4(x+y)} = rac{x-y}{4}$$