giúp mình với ạ, thankss

`L = ([x^3 - 1]/[x^2 - x] - [x^3 + 1]/[x^2 + x]) : [2.(x^2 - 2x + 1)]/[x^2 - 1]`

`L = ([(x - 1).(x^2 + x + 1)]/[x.(x - 1)] - [(x + 1).(x^2 - x + 1)]/[x.(x + 1)]) : [2.(x - 1)^2]/[(x - 1).(x + 1)]`

`L = ([x^2 + x + 1]/x - [x^2 - x + 1]/x : [2.(x  - 1)]/[x + 1]`

`L = [x^2 + x +1  - x^2 + x - 1]/x : [2.(x  - 1)]/[x + 1]`

`L = [2x]/x : [2.(x  - 1)]/[x + 1]`

`L = 2. [x + 1]/[2.(x - 1)]`

`L = [x + 1]/[x - 1]`

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`M = (1 + x/(x^2 + 1)) : (1/[x - 1] - [2x]/[x^3 + x - x^2 - 1])`

`M = (x^2 + 1 + x)/(x^2 + 1) : (1/[x - 1] - [2x]/[x.(x^2 + 1) - (x^2 + 1)])`

`M = (x^2 + 1 + x)/(x^2 + 1) : (1/[x - 1] - [2x]/[(x^2 + 1).(x - 1)])`

`M = (x^2 + 1 + x)/(x^2 + 1) : [x^2 + 1 - 2x]/[(x^2 + 1).(x - 1)]`

`M = (x^2 + 1 + x)/(x^2 + 1) : [(x - 1)^2]/[(x^2 + 1).(x - 1)]`

`M = (x^2 + 1 + x)/(x^2 + 1) : [x - 1]/(x^2 + 1)`

`M =(x^2 + 1 + x)/(x^2 + 1) . (x^2 + 1)/(x - 1)`

`M = (x^2 + 1 + x)/(x - 1)`