include<stdio.h> int main(){float a,b,c,x1,x2,disc;printf("请输入a,b,c的值");scanf_s("%f%f%f",&a,&b,&c);disc=bb-4ac;if(disc>0){x1=(-b+sqrt(disc))/(2a);x2=(-b-sqrt(disc))/(2a);printf("%f%f",x1,x2);}else if(disc==0){x1=(-b+sqrt(disc))/(2a);x2=(-b-sqrt(disc))/(2*a);printf("%f%f",x1,x2);...