c语言程序设计题目:计算一元二次方程的根答:include <stdio.h> /***SPACE***/ include <math.h> void main(){ float a,b,c,disc,x1,x2,realpart,imagpart;scanf("%f%f%f",&a,&b,&c);printf("the equation");/***SPACE***/ if( a <=1e-6)printf("is not quadratic\n");else { disc=b*b-4*a*c;if(fabs(disc)<...