以下程序的功能是计算函数F(x,y,z)=(x+z)/(y-z)+(y+2*z)/(x-2*z)的值,请将程序补充完整。#include
float f(float x,float y){ float value; value= ________; return value;} void main(){ float x,y,z,sum; scanf("%f%f%f",&x,&y,&z); sum=f(x+z,y-z)+f(y+2*z,x-2*z); printf("sum=%f\n",sum);}