# include <stdio.h># include <sys/timeb.h>int main(void){ timeb t1, t2; long t; int i, n; double x, sum1, sum; sum1 = 1; sum = 1; printf("Please input x and n: "); scanf("%lf%d", &amp;x, &amp;n); ftime(&amp;t1); //求的当前时间 for (i=1; i<=n; ++i) { sum1 *= -1....