...................**********&*
А) 2(х^2-1)/3(х^2+2х+1)= 2(х-1)×(х+1)/3(х+1)^2= 2(х-1)/3(х+1) 2х-2/3х+3 б)2(4-4t+t^2)= 2(2-t)×(2+t)= 2(2-t)/3(2+t)= 4-2t/6+3t в)x^2-16xy^2= x×(x-16y^2)