Đáp án:
`Q=1`
Giải thích các bước giải:
`Q=(sqrtx/(sqrtx-sqrty)-sqrty/(sqrtx+sqrty)-(2y)/(x-y))(x,y>=0,x ne y)`
`Q=((sqrtx(sqrtx+sqrty))/((sqrtx-sqrty)(sqrtx+sqrty))-(sqrty(sqrtx-sqrty))/((sqrtx-sqrty)(sqrtx+sqrty))-(2y)/((sqrtx-sqrty)(sqrtx+sqrty)))`
`Q=((x+sqrt{xy})/((sqrtx-sqrty)(sqrtx+sqrty))-(y-sqrt{xy})/((sqrtx-sqrty)(sqrtx+sqrty))-(2y)/((sqrtx-sqrty)(sqrtx+sqrty)))`
`Q=((x+sqrt{xy}-sqrt{xy}+y-2y)/((sqrtx-sqrty)(sqrtx+sqrty)))`
`Q=(x-y)/(x-y)`
`Q=1`
