如何简单理解用C语言调用三个函数求a*x^2+b*x+c=0，分别求b^2-4*a*的各个情况的根

#include<stdio.h> #include<math.h>//调用数学库 double x1,x2;//全局变量x1,x2 int main() { void m1(double a,double b,double c); void m2(double a,double b,double c); void m3(double a,double b,double c); double a,

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