Đáp án+Giải thích các bước giải:

`K=(2/(\sqrtx-2)+(\sqrtx-1)/(2\sqrtx-x)):(\sqrtx+2)/\sqrtx-(\sqrtx-1)/(\sqrtx-2)`    `(x>=0;x\ne4)`

`K=(2/(\sqrtx-2)-(\sqrtx-1)/(\sqrtx(\sqrtx-2)))xx\sqrtx/(\sqrtx+2)-(\sqrtx-1)/(\sqrtx-2)`

`K=(2\sqrtx-\sqrtx+1)/(\sqrtx(\sqrtx-2))xx\sqrtx/(\sqrtx+2)-(\sqrtx-1)/(\sqrtx-2)`

`K=(\sqrtx+1)/(\sqrtx(\sqrtx-2))xx\sqrtx/(\sqrtx+2)-(\sqrtx-1)/(\sqrtx-2)`

`K=(\sqrtx+1)/((\sqrtx-2)(\sqrtx+2))-(\sqrtx-1)/(\sqrtx-2)`

`K=(\sqrtx+1-(\sqrtx-1)(\sqrtx+2))/((\sqrtx+2)(\sqrtx-2))`

`K=(\sqrtx+1-(x+2\sqrtx-\sqrtx-2))/((\sqrtx+2)(\sqrtx-2))`

`K=(\sqrtx+1-x-\sqrtx+2)/((\sqrtx+2)(\sqrtx-2))`

`K=(3-x)/((\sqrtx+2)(\sqrtx-2))`