Сократить дробь 16-4y/16-y^2. m^2-4mn+4n^2/m^2-4n^2
(16- 4у) / (16- у^2) = = 4(4-y) / (4-y)(4+y)= = 4/(4+y) (m^2-4mn +4n^2 ) / (m^2-4n^2) = =(m-2n) ^2 / (m-2n)(m+2n)= = (m-2n) / (m+2n)