Question

(a-2分之a-a的平方-2a分之4)÷a的平方分之a+2

Answer 1

解

[a/(a-2)-4/(a²-2a)]÷(a+2)/a²

=[a²/a(a-2)-4/a(a-2)]×a²/(a+2)

=(a²-4)/a(a-2)×a²/(a+2)

=(a-2)(a+2)/a(a-2)×a²/(a+2)

=(a+2)/a×a²/(a+2)

=a