1.化简:4/(x^2-16)除以2/(x-4)+x/(x+4)2.计算{a+2/(a^2-2a)+8/(4-a^2)}除以a-2/a

问题描述:

1.化简:4/(x^2-16)除以2/(x-4)+x/(x+4)
2.计算{a+2/(a^2-2a)+8/(4-a^2)}除以a-2/a