Question

Y=根号下x-1+根号下1-x,则xy=

Answer 1

Y=根号下x-1+根号下1-x
由于根号下为非负，所以x-1≥0，1-x≥0
解得x=1、y=0
xy=0

Answer 2

x-1≥0, 1-x≥0 得x=1 ,y=0, xy= 0

Answer 3

x-1>=0 1-x>=0 ∴ x=1 y=0 xy=0