化简:6/(x^2-9)+1/(x+3)

问题描述:

化简:6/(x^2-9)+1/(x+3)

原式=6/((X-3)*(X+3))+1/(X+3)
=6/((X-3)*(X+3))+(X-3)/((X-3)*(X+3))
=(6+(X-3))/((X-3)*(X+3))
=(X+3)/((X-3)*(X+3))
=1/(X-3)