#include <iostream> using namespace std: int main( fint numl=2897, num2=5, num=837, num4=34,num5=7,num6=1623, num7=390,num8=3456,num9=12; 显示第一行数 cout<<mum1<<"";∥muml后面空了3个空格 cout<< num2<< cout < num << endl ∥显示第二行数 cout<< numa<< cout < num cout << numb<< endl ∥显示第三行数 cout < num7 cout < num8<< cout << num << endl return 0 见1-9cpp#include <iostream> using namespace std; int main( ) { int num1 = 2897, num2 = 5, num3 = 837, num4 = 34, num5 = 7, num6 = 1623, num7 = 390, num8 = 3456, num9 = 12 ; // 显示第一行数 cout << num1 << " " ; // num1后面空了3个空格 cout << num2 << " " ; cout << num3 << endl ; // 显示第二行数 cout << num4 << " " ; cout << num5 << " " ; cout << num6 << endl ; // 显示第三行数 cout << num7 << " " ; cout << num8 <<" " ; cout << num9 << endl ; return 0; } 见1-9.cpp