There is an eight-story pagoda here, which consists of a series of equations. In each equation, the number on the left increases 1 and the number on the right decreases 1.

1×8+ 1=9

12×8+2=98

123×8+3=987

1234×8+4=9876

12345×8+5=98765

123456×8+6=987654

1234567×8+7=9876543

12345678×8+8=98765432

Change every number on the right side of the pagoda above to the left, and you can get the following number of other pagodas.

9×9+7=88

98×9+6=888

987×9+5=8888

9876×9+4=88888

98765×9+3=888888

987654×9+2=8888888

9876543×9+ 1=88888888

98765432×9+0=888888888

Through deformation, a new number of towers can be obtained.

For example, take out the bottom line of the first tower:

12345678×8+8=98765432.

Add the first number on the left 12345678 to both sides of it at the same time, and then add 1 to both sides.

12345678×8+ 12345678+8+ 1

=98765432+ 12345678+ 1,

namely

12345678×9+9= 1 1 1 1 1 1 1 1 1.

From this line to the top, each line is similarly deformed, and another tower with a completely different shape is obtained.

The new tower is also eight stories, and a tower with similar structure is added to get the nine-story tower in the previous section.