57

两种办法
一
#include <bits/stdc++.h>
using namespace std;

int main()
{
for (int i = 1; i <= 9; i++)
{
for (int j = 1; j <= i; j++)
{
printf("%d*%d=%2d ", j, i, i * j);
}
cout << endl;
}
return 0;
}
二
#include<bits/stdc++.h>
using namespace std;

int main()
{
cout << "11= 1" << endl;
cout << "12= 2 22= 4"<< endl;
cout << "13= 3 23= 6 33= 9"<< endl;
cout << "14= 4 24= 8 34=12 44=16"<< endl;
cout << "15= 5 25=10 35=15 45=20 55=25"<< endl;
cout << "16= 6 26=12 36=18 46=24 56=30 66=36"<< endl;
cout << "17= 7 27=14 37=21 47=28 57=35 67=42 77=49"<< endl;
cout << "18= 8 28=16 38=24 48=32 58=40 68=48 78=56 88=64"<< endl;
cout << "19= 9 29=18 39=27 49=36 59=45 69=54 79=63 89=72 9*9=81"<< endl;
return 0;
}