//Dev-C++ 5.11#include <iostream>#include <stdlib.h>#include <ctime>using namespace std;int main(void) {const int m=5;
 int Matrix[m][m],sum; sum=0;
 srand(time(NULL));
 cout<<"Matrix"<<endl;
 for(int i=0;i<m;i++)
  {for(int j=0;j<m;j++)
   {Matrix[i][j]=rand()%5;
   if(i==j)sum=sum+Matrix[i][j];
   cout<<Matrix[i][j]<<" ";}  cout<<endl;} cout<<"Sum="<<sum; return 0;}

Y=×2-9×+3y=×2+9×y=11y=11+3y=14