If x1
- if x1 x2 and f is a decreasing function
- if x1 x2 are the roots of ax2+bx+cu003d0
- if x1 x2 are the roots of the equation x^2+bx+c
- if x1 x2 x3...xn are in hp
- if x1 x2 and x3 are enthalpies of h-h
- if x1 and x2 are the roots of the equation
- if x1 x2 x3 are the roots of the equation
- if x1 y1 are roots of x^2+8x-20u003d0
- if x1 x2 x3...xn are in ap
- if x1 x2 x3
