九九乘法表，右上三角与右下三角的有关问题

九九乘法表，右上三角与右下三角的问题
用VB2010以上的版本：
写出下面两种排版格式的九九乘法表：
1.右上三角型的：
1x1=1    1x2=2    1x3=2    1x4=4    1x5=5    1x6=6    1x7=6    1x8=6    1x9=9
              2x2=4    2x3=6    2x4=8    2x5=10  2x6=12  2x7=14  2x8=16  2x9=18
                            3x3=9    3x4=12 ............................................................................................
                                           .....................................

                                                                                                                  9x9=81


2.右下三角型的：
                                                                                                                 1x1=1
                                                                                                   1x2=2    2x2=4
                                                                                     1x3=3    2x3=6    3x3=9
                                                                     1x4=4     2x4=8    3x4=12  4x4=16    
                                                                                                              ......
1x9=9    2x9=18 ...... ......................................................................................................... 9x9=81                                                                                                                                                           

请问要怎么写代码？