1) Напишите программу, которая вводит естественное число N и выводит 1-ые

1)
include lt;iostreamgt;
using namespace std;

int main()

int n = 0;
cin gt;gt; n;
for (int i = 0; i lt; n; ++i)
cout lt;lt; 2 * i lt;lt; endl;

return 0;

2)
include lt;iostreamgt;
include lt;cmathgt;
using namespace std;

int main()

int a = 0, b = 0;
cin gt;gt; a gt;gt; b;
for (int i = a; i lt;= b; ++i)
cout lt;lt; pow(i, 2) lt;lt; endl;

return 0;

3)
include lt;iostreamgt;
include lt;cmathgt;
using namespace std;

int main()

int a = 0, b = 0, sum = 0;
cin gt;gt; a gt;gt; b;
for (int i = a; i lt;= b; ++i)
sum += pow(i, 2);

cout lt;lt; sum lt;lt; endl;
return 0;