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10000-0 is safe,
No three no four!
How much is 1000-999-998 + 997 + 996-995-994 + 993 +. + 104-103-102 + 101?
1000-999-998+997+996-995-994+993+.+104-103-102+101
In pairs
=1-1+1-1+...+1-1
=0
2 × 1000 out of 999 is a simple calculation
Original formula = 2 / 999 × (999 + 1)
=2 + 2 / 999
=2 and 2 / 999
How to calculate: 98 + 999 + 9996 + 99997 + 10
Take 10 Apart: 10 = 2 + 1 + 4 + 3
98+999+9996+99997+10=98+999+9996+99997+（2+1+4+3）
=（98+2）+（999+1）+（9996+4）+（99997+3）
=100+1000+10000+100000
=111100
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