计算：2.（3/a-2+12/a²-4）÷（2/a-2-1/a+2）
问题描述：
计算：2.（3/a-2+12/a²-4）÷（2/a-2-1/a+2）
答
=7.68-【65‘、097，
答
[3/(a-2)+12/(a^2-4)]÷[2/(a-2)-1/(a+2)]
=[3(a+2)/(a-2)(a+2)+12/(a-2)(a+2)]÷[2(a+2)/(a-2)(a+2)-(a-2)/(a-2)(a+2)]
=[(3a+6+12)/(a-2)(a+2)]÷[(2a+4)/(a-2)(a+2)-(a-2)/(a-2)(a+2)]
=[(3a+18)/(a-2)(a+2)]÷[(2a+4-a+2)/(a-2)(a+2)]
=[3(a+6)/(a-2)(a+2)]÷[(a+6)/(a-2)(a+2)]
=[3(a+6)/(a-2)(a+2)]*(a-2)(a+2)/(a+6)
=3
答
2.（3/a-2+12/a²-4）÷（2/a-2-1/a+2）
=(3a+6+12)/(a+2)(a-2)÷(2a+4-a+2)/(a+2)(a-2)
=3