#include <stdio.h>
#include <math.h>
int main (void)
{ float u2=63.5, b=1.86,u ,i, r, r3=4.8, r2;
int r1=15, u1=120;
i=(u+u2)/(r+r3);
r=(r1*r2)/(r1+r2);
printf("r2=%f, r=%f, u=%f, i=%f",r2
,r
,u
,i
); }
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