(1+12+123+1234+.+123.56789)÷4

Original formula = (1 + 10 + 100 +... + 100000000 + 2 + 20 + 200 +... 20000000 +... + 8 + 80 + 9) / 4 = [(1 + 2 + 3 + 4 +... + 8 + 9) + (10 + 20 + 30 +... + 80) +... + 100000000] / 4 = (45 + 360 + 2800 + 21000 + 150000 + 10000000 + 600000 + 30000000 + 100000000) / 4 = 45 / 4 + 3

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