giúp với ạhbbhbbhhbbbbbbbvvvvvvvvvvvvvvu

`1`

`y=[2x+1]/[x-1]`

`-> y'=[(2x+1)'(x-1)-(x-1)'(2x+1)]/[(x-1)^2]`

`-> y'=[2(x-1)-(2x+1)]/[(x-1)^2]`

`-> y'=[2x-2-2x-1]/[(x-1)^2]`

`-> y'=[-3]/[(x-1)^2]`

`2`

`y=[(x-2)^2]/[1-x]`

`-> y'=[[(x-2)^2]'(1-x)-(1-x)'(x-2)^2]/[(1-x)^2]`

`-> y'=[2(x-2) (x-2)'(1-x)+(x-2)^2]/[(1-x)^2]`

`-> y'=[2(x-2)(1-x)+(x-2)^2]/[(1-x)^2]`

`-> y'=[-2x^2+6x-4+x^2-4x+4]/[(1-x)^2]`

`-> y'=[-x^2+2x]/[(1-x)^2]`

`-> color[yellow][bbA]`