收起
1.化简:4/(x^2-16)除以2/（x-4）+x/（x+4）
=4/(x+4)(x-4)×(x-4)/2+x/(x+4)
=2/(x+4)+x/(x+4)
=(x+2)/(x+4)
迷心咒H
2.计算{a+2/(a^2-2a)+8/(4-a^2)}除以a-2/a
=a²/(a-2)+2/(a-2)²-8a/(a+2)(a-2)²
=(a²(a+2)(a-2)+2(a+2)-8a)/(a+2)(a-2)²
=(a^4-4a^2-6a+2)/(a+2)(a-2)^2;
如果本题有什么不明白可以追问,