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Practice innovative exercises in one lesson in the fourth grade of primary school1+3+5+7+...+2009+201= How to calculate with a simple method?
1+3+5+7+.........+2009+20 1 1

=( 1+20 1 1)+(3+2009)+(5+2007)+(7+2005)+........+( 1005+ 1007)

=20 12* 1005

=2022060

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