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 approximati