答:√[(x-1)²+(x-1)²]=x
√[2(x-1)²]=x>=0
两边平方得:2(x²-2x+1)=x²
x²-4x+2=0
(x-2)²=2
x-2=√2或者x-2=-√2
所以:x=2+√2或者x=2-√2