展开全部#include include int main() { double a,b,c,s,p;scanf("%lf%lf%lf",&a,&b,&c);p=(a+b+c)/2;s=sqrt(p*(p-a)*(p-b)*(p-c));printf("三角形面积为%.2lf\n",s);return 0;} 20210311
#include <stdio.h>main(){ int m, n, i, j, count; count = 0; for ( m = 90, i = 1; m > 0; ++i, m-= 10) for ( n = m - 5, j = 1; n > 0; ++j, n -= 5 ) printf("第%4d种: 共%2d张 : %2d 张10元, %...