1*1= 1
                                                           1*2= 2  2*2= 4
                                                      1*3= 3  2*3= 6  3*3= 9
                                                 1*4= 4  2*4= 8  3*4=12  4*4=16
                                             1*5= 5  2*5=10  3*5=15  4*5=20  5*5=25
                                        1*6= 6  2*6=12  3*6=18  4*6=24  5*6=30  6*6=36
                                   1*7= 7  2*7=14  3*7=21  4*7=28  5*7=35  6*7=42  7*7=49
                              1*8= 8  2*8=16  3*8=24  4*8=32  5*8=40  6*8=48  7*8=56  8*8=64
                         1*9= 9  2*9=18  3*9=27  4*9=36  5*9=45  6*9=54  7*9=63  8*9=72  9*9=81

#include<stdio.h>
int main()
{
    int i,j,k;
    for(i=1;i<10;i++)
    {
        for(j=1;j<10-i;j++)
        {
            printf("  ");
        }
        for(j=1;j<=i;j++)
        {
            printf("%d*%d=%d ",j,i,i*j);
        }
        printf("\n");
    }
}

谢谢！我就是那个九九不知道怎么排列！