C语言编写一个求两点距离公式,求三角形面积答:include<stdio.h>#include<math.h>float b(float x,float y,float m,float n){ float d; d=sqrt((x-m)*(x-m)+(y-n)*(y-n)); return(d);}int main(){ float x1,x2,x3,y1,y2,y3,d1,d2,d3,s,q; scanf("(%f,%f)(%f,%f)(%f,%f)",&x1,&y1,&x2,&y2,&x3...