现行教材苏教版《数学1》的“函数与方程”小节中,有这么一个结论:“一般地,若函数y=f(x)在区间[a,b]上的图象是一条不间断的曲线,且f(a)·f(b)<0,则函数y=f(x)在区间(a,b)上有零点.”道理是显然的,可以用图作出解释,如图1.虽然教材中没有特别注明,但确实有许多参考书和杂志都称这是函数的零点原理.利用零点原理 There is a conclusion in the “Functions and Equations” section of the current textbook “Mathematics 1” of the Sujiao edition: “Generally, if the image of the function y = f (x) in the interval [a, b] is An unbroken curve with f (a) · f (b) <0 then the function y = f (x) has a zero on the interval (a, b). ”The rationale is obvious and can be explained graphically , As shown in Figure 1. Although there is no special note in the textbook, but there are indeed many reference books and magazines called this function zero principle.Using zero principle