Calculation of 9.9 * 101 with simple method
Original formula = 99 * 101 / 10 = (100-1) * (100 + 1) / 10 = (100 * 100-1) / 10 = 999.9
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- 17. 1+2+3+、、、、、、、、、、、、、、、、、+99+1000+1001
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