化简因式
问题描述:
化简因式
^2表示平方
[(3a^2+6a+3)/(a^2-9)]/[(a+1)^2/(a^2-6a+9)]
答
[(3a^2+6a+3)/(a^2-9)]/[(a+1)^2/(a^2-6a+9)]
=[(3a+3)(a+1)/(a+3)(a-3)]/[(a+1)^2/(a-3)^2]
=[3(a+1)/(a-3)]/[(a+1)^2/(a-3)^2]
=3(a-3)/(a+1)