DW Web authoring, math, database management

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Mathematics (Application of inequalities): 1. If the unary two-order equation has a root, then the root must be the bounded point of the solution set of the one-dollar two-time inequalities. Vice versa.
If the solution set of the inequality x^2+bx+c<0 is (2,3), it is known that 2,3 is the two root of the equation x^2+bx+c=0.
2. The function f (x) of the function value equals zero x, which is the solution of the equation F (x) =0. The geometrical meaning is the horizontal axis of the parabolic Y=F (x) and the x-axis intersection.
3. The function f (x) of the function value is greater than (less than) zero X, is the solution of the inequality f (x) >0 (<0). The geometrical meaning is the horizontal axis of the parabolic Y=F (x) located above the x-axis (lower) point.

DW Web authoring, math, database management