сократите дробь

а)[tex] \frac{15-5y}{q-y{2} }[/tex]

б) [tex] \frac{m^{2}-4mn+4n^{2} }{m^2-4n^2} [/tex]

a)(15-5y)/(9-yˇ2)=5(3-y)/(3+y)(3-y)=5/(3+y)b)(mˇ2-4mn+4nˇ2)/(mˇ2-4nˇ2)==(m-2n)(m-2n)/(m+2n)(m-2n)=(m-2n)/(m+2n)