2/1 3/2 5/3 8/5 13/8 21/13 34/21 55/34 89/55 144/89 233/144 377/233 610/377 987/610 1597/987 2584/1597 4181/2584 6765/4181 10946/6765 17711/10946
前20项之和:32.660259
附上程序:
#include <stdio.h>
void main()
{
int i;
float a, b, c, s;
a = b = 1.0;
c = 0;
s = 0;
for(i = 0; i < 20; i++)
{
c = a + b;
s = s + c / a;
printf("%.0f/%.0f ", c, a);
b = a;
a = c;
}
printf("\n%f\n", s);
}
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