化简:4/(x2-16)÷ 2/(x-4)+x/(x+4)

问题描述:

化简:4/(x2-16)÷ 2/(x-4)+x/(x+4)

=4/(x-4)(x+4) X(x-4)/2+x/(x+4)
=2/(x+4)+x/(x+4)
=(x+2)/(x+4)