解:原式=2x²-x-1+(根号2+1)x-x² =x²+根号2x-1 代入后,得出原式=-1
(2x+1)(x-1)+x(根号2+1-x)=2xx-x-1+根号2*x+x-xx=xx+根号2*x-1=2-2-1=-1
:(2x+1)(x-1)+x(根号2+1-x)=2x平方-2x+x-1+x倍根号2+x-x平方=x平方+(2-根号2)x-1=(-根号2)平方+(2-根号2)(-根号2)-1=2-2倍根号2+2-1=3-2倍根号2