...2+x^3-x^4+...(-1)^n-1x^n,其中用函数power(x,n)求x^n,答:include <stdio.h> int power(int x,int n){ int p=1,i;for(i=1;i<=n;i++)p*=x;return p;} int fun(int x,int n){ int s=0,i;for (i=2;i<=n;i++)s+=power(-1,i-1)*power(x,i);return s;} int main(int argc, char *argv[]){ int x,n;printf("请输入x...