Giúp mình với mn ơi.

`([x-2]/[x^2-1]-[x+2]/[x^2+2x+1]) * ([1-x^2]/2)^2=0 (x ne +-1)`

`<=> [[x-2]/[(x-1)(x+1)]-[x+2]/[(x+1)^2]] * [(x^2-1)^2]/4=0`

`<=> [[(x-2)(x+1)]/[(x-1)(x+1)^2]-[(x+2)(x-1)]/[(x-1)(x+1)^2]] * [(x^2-1)^2]/4=0`

`<=> [x^2-x-2+x^2-x+2]/[(x-1)(x+1)^2] * [(x-1)^2 * (x+1)^2]/4=0`

`<=> [2x^2-2x]/[(x-1)(x+1)^2] * [(x-1)^2 * (x+1)^2]/4=0`

`<=> [(2x^2-2x)(x-1)]/2=0`

`<=> (2x^2-2x)(x-1)=0`

`<=> 2x(x-1)^2=0`

`<=> x=0(text[n])` hoặc `x=1(text[l])`

`->S={0}`

`#2`