重点考查s=sqrt(p(pa)(pb)(pc));参考代码如下：intmain(){floata，b，c;floats;floatp;scanf(“%f%f%f”，&a，&b，&c);p=(a+b+c)/.;s=sqrt(p(pa)(pb)(pc));printf(“%f”，s);}或voidmain(){floata，b，c;floats;floatp;scanf(“%f%f%f”，&a，&b，&c);p=(a+b+c)/.;s=sqrt(p(pa)(pb)(pc));printf(“%f”，s);}或main(){floata，b，c;floats;floatp;scanf(“%f%f%f”，&a，&b，&c);p=(a+b+c)/.;s=sqrt(p(pa)(pb)(pc));printf(“%f”，s);}、从键盘读入二次方程系数a，b，c，假设其有实数根，请输出其根