化简：6/(x^2-9)+1/(x+3)

1个回答

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)