20 10 what is the ninth question of mathematics in the Shiyan senior high school entrance examination?
X 3+x-1= 0 can be changed to x 2+1-1/x = 0, or x 2+1=/x? This equation can be regarded as the abscissa of the intersection of functions y = x 2+1and y= 1/x, and the function image can be drawn to determine: 1/2.