√(x-1)-√(1-x)=(x+y)²√(x-1)>=0,x>=1√(1-x)>=0x<=1所以x=1√(x-1)-√(1-x)=(x+y)²(1+y)²=0y=-1x-y=1-(-1)=2
x-1≥01-x≥0x=1,y=-1x-y=2