【数学分式计算,(a²-4)分之2a-(a-2)分之1(x-3)分之1-(x+3)分之1
(a²-4)分之2a-(a-2)分之1
(x-3)分之1-(x+3)分之1
(a²-4a+4)分之(a-1)÷(a²-4)分之(a²-1)
【(x-2)分之3x-(x+2)分之x】×x分之(x²-4)