(1-根号2)x的平方=(1+根号2)x
(1-根号2)x的平方-(1+根号2)x=0
x*【（1-√2）x-(1+√2)】=0
x1=0,(1-√2）x-(1+√2)=0
所以x1=0.x2=(1+√2)/(1-√2)=-(√2+1)²=-3+2√2