(1).(x/x-1)*(x^2-1/x^2) (2).(a^2-b^2/ab)除以

问题描述:

(1).(x/x-1)*(x^2-1/x^2) (2).(a^2-b^2/ab)除以
(1).(x/x-1)*(x^2-1/x^2)
(2).(a^2-b^2/ab)除以(a-b)^2
(3).(m-2/m^2-2m+1)除以m^2-4/m^2-1

(1)(x+1)/x
(2)(a+b)/(a-b)ab
(3)(m+1)/(m-1)(m+2)要过程!