Question

化解分式a^2+6a+9分之a^2-9/a^2+3a分之a-3-a-1分之a-a^2

Answer 1

原式=(a+3)(a-3)/(a+3)²×a(a+3)/(a-3)+a(a-1)/(a-1)

=(a-3)/(a+3)×a(a+3)/(a-3)+a

=a+a

=2a