通过每次把f(x)的零点所在小区间收缩一半的方法，使区间的两个端点逐步迫近函数的零点，以求得零点的近似值，这种方法叫做二分法-By the time f (x) between the zero shrinkage area where half of the ways in which the two endpoints of interval functions gradually approaching zero, in order to achieve zero approximation, this method is called the dichotomy