(a2-4/a2-4a+3)×(a-3/a2+3a+2=?
问题描述:
(a2-4/a2-4a+3)×(a-3/a2+3a+2=?
答
原式=[(a²-4)/(a²-4a+3)]×[(a-3)/(a²+3a+2)]
={(a-2)(a+2)/[(a-1)(a-3)]}×{(a-3)/[(a+1)(a+2)]}
=(a-2)/[(a-1)(a+1)]