若√x-√y与√x+√y互为倒数,则( ) A.x=y-1.B.x=y+1 C.x=1-y.D.x=若√x-√y与√x+√y互为倒数,则( )A.x=y-1.B.x=y+1C.x=1-y.D.x=-y-1
选B.x=y+1若√x-√y与√x+√y互为倒数,则(√x-√y((√x+√y)=1x-y=1