(a-2)/(a+3)/ [(a^2-4)/(a^2+6a+9)]=(a-2)(a^2+6a+9) / (a+3)(a^2-4)
=(a-2)(a+3)(a+3) / (a+3)(a-2)(a+2)
=(a+3)/(a+2)
答案看图片
(a-2)/(a+3)/[(a^2-4)/(a^2+6a+9)]
=(a-2)/(a+3)/[((a+2)(a-2))/(a+3)^2]
=[(a-2)/(a+3)]x[(a+3)^2/(a+2)(a-2)]
=(a+3)/(a+2)
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