Matematik ilginçtir

................1x8+1=9
..............12x8+2=98
............123x8+3=987
.........1234x8+4 =9876
........12345x8+5=98765
......123456x8+6=987654
....1234567x8+7=9876543
..12345678x8+8=98765432
123456789x8+9=987654321