giúp câu b`-` c bài 14 ạ

`b, ((x^2+4x+4)/(x^2-3x))*((x-3)/(x+2))`

`=((x+2)^2/(x(x-3))*((x-3)/(x+2))`

`=((x+2)^2*(x-3))/((x(x-3)(x+2))`

`=(x+2)/x`

`c, (x/(x^2-25)-(x-5)/(x^2+5x)) : (2x-5)/(x^2+5x)`

`=(x/((x-5)(x+5)-(x-5)/(x(x+5)))) : (2x-5)/(x^2+5x)`

`=((x*x-(x-5)(x-5))/(x(x-5)(x+5))) : (2x-5)/(x^2+5x)`

`=(x^2-x^2+10x-25)/(x(x-5)(x+5)) : (2x-5)/(x^2+5x)`

`=(10x-25)/(x(x-5)(x+5)) : (2x-5)/(x^2+5x)`

`=(5(2x-5))/(x(x-5)(x+5)) : (2x-5)/(x^2+5x)`

`=(5(2x-5))/(x(x-5)(x+5)) * (x^2+5x)/(2x-5)`

`=(5(2x-5))/(x(x-5)(x+5)) * (x(x+5))/(2x-5)`

`=(5(2x-5)*x(x+5))/((x(x-5)(x+5)(2x-5))`

`=5/(x-5)`

Ban có thể tham khảo~!