Giúp tớ vớiiiiiiiiii

 `1,A=2/(sqrtx -1)+2/(sqrtx +1)- (5-sqrtx)/(x-1)`

`=(2(sqrtx+1))/((sqrtx -1)(sqrtx+1))+(2(sqrtx-1))/((sqrtx -1)(sqrtx+1))- (5-sqrtx)/((sqrtx -1)(sqrtx+1))`

`=(2sqrtx+2+2sqrtx -2 -5+sqrtx)/((sqrtx -1)(sqrtx+1))`

`=(5sqrtx-5)/((sqrtx -1)(sqrtx+1))`

`=(5(sqrtx-1))/((sqrtx -1)(sqrtx+1))`

`=5/(sqrtx+1)`

`2,`Thay `x= 3-2sqrt2` ta có:

`A=5/(sqrt(3-2sqrt2)+1)`

`=5/(sqrt((sqrt2 -1)^2)+1)`

`=5/(sqrt2 -1+1)`

`=5/sqrt2`