#include<stdio.h>
#include<math.h>
int main()
{
double（x1,x2,x3,y1,y2,y3,x,y,a,b,c）;
scanf(%lf%lf%lf,&x1&x2&x3);
scanf(%lf%lf%lf,&y1&y2&y3);
a=sqrt(（x2-x1）^2+（y2-y1）^2);
b=sqrt(（x3-x1）^2+（y3-y1）^2);
c=sqrt(（x3-x2）^2+（y3-y2）^2);
x=(a*x1+b*x2+c*x3)/(a+b+c);
y=(a*y1+b*y2+c*y3)/(a+b+c);
printf(“%.2f”,x,y);
}

一楼