Question

сократите дробь ) 9p^2-q^2/9p^2+6pq+q^2

Answer 1

$frac{ 9p^{2}- q^{2} }{ 9p^{2} +6pq+ q^{2} } = frac{(3p-q)(3p+q)}{ (3p+q)^{2} } = frac{3p-q}{3p+q}$ 
вот так вот )