m^3+4m^2+4m/m^3-4m=m(m+2)^2/m(m+2)(m-2)=(m+2)/(m-2)a＾2－3a＋2／a＾2－4a＋3=(a-1)(a-2)/(a-1)(a-3)=(a-2)/(a-3)x＾＋5x－6／x＾2－3x＋2=(x-2)(x-3)/(x-1)(x-2)=(x-3)/(x-1)