(Х-3)^2 / (х^2-3х+9) * (х+3)(х^2-3х+9) / 3(х-3) = (х-3) * х+3 / 3 = (х-3)(х+3)/3 = х^-9
1/5(а^2+2аб+4б^2) * (а-2б)(а^2+2аб+4б^2) = 1/5(а-2б)= 1/5а-2/5б
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(Х-3)^2 / (х^2-3х+9) * (х+3)(х^2-3х+9) / 3(х-3) = (х-3) * х+3 / 3 = (х-3)(х+3)/3 = х^-9
1/5(а^2+2аб+4б^2) * (а-2б)(а^2+2аб+4б^2) = 1/5(а-2б)= 1/5а-2/5б