解;a�0�6-4a+3 =a�0�6-a-3a﹢3=(a�0�6-a)-(3a-3)=a(a+1)(a-1)-3(a-1)(a-1)[a(a+1)-3]
a^3-4a+3=a^3-a^2+a^2-4a+3=a^2(a-1)+(a-1)(a+3)=(a-1)(a^2+a+3)