-7 a Natale: l’albero della Matematica

1
1×1
1x1x1

0x9+1 = 1
1×9+2  =  11
12×9+3 = 111
123×9+4 = 1111
1234×9+5 = 11111
12345×9+6 = 111111
123456×9+7 = 1111111
1234567×9+8 = 11111111
9×9+7 =  88 
98×9+6 = 888 
987×9+5 = 8888
9876×9+4 = 88888
98765×9+3 = 888888
987654×9+2 = 888888
9876543×9+1 = 8888888
98765432×9+0 = 88888888
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
123456789×8+9 = 987654321

111
111
111
111

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