Формула (а-б)^2= а^2-2аб+б^2(Х-1/4)^2=х^2Х^2- 2•Х•1/4+(1/4)^2=х^2Х^2-2/4х+1/4•1/4=х^2Х^2-1/2х+1/16=х^2Х^2-1/2х-х^2=-1/16-1/2х=-1/16Х=-1/16: -1/2Х=-1/16• -2/1Х= 1/8Проверка( 1/8 -1/4)^2= (1/8)^2( 1/8- (1•2)/(4•2))^2=1/8•1/8(1/8- 2/8)^2= 1/64(-1/8)^2=1/64(-1/8)• (-1/7)= 1/641/64=1/64