# include≤ stdio h> include <math.h> int main o double a, b, c, disc,x1,x2, p, qi scanf("%/lfo/lf%/lf",&a, &b, &c); 631 disc=b*b-4aCi 计算b24ac,disc的值变为-15#include <stdio.h> #include <math.h> int main ( ) { double a,b,c,disc,x1,x2,p,q; scanf("%lf%lf%lf",&a,&b,&c); disc=b*b-4*a*c; 计算b2 -4ac，disc的值变为-15