计算(1+3+5..+2009)-(2+4+6+2010)

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计算(1+3+5..+2009)-(2+4+6+2010)
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计算(1+3+5..+2009)-(2+4+6+2010)
计算(1+3+5..+2009)-(2+4+6+2010)

计算(1+3+5..+2009)-(2+4+6+2010)
(1+3+5..+2009)-(2+4+6+2010)
=(1-2)+(3-4)+(5-6)+.+(2009-2010)
=-1-1-1-.-1
=-1*2010/2
=1005

(1+3+5+……+2009)
=(1+2009)/2
=1005

(2+4+6+……+2010)
=[(2-2010)/2]
=1006

(1005-1006)*1005
=-1050

(1+3+5.。。。+2009)-(2+4+6+2010)

=(1-2)+(3-4)+(5-6)+....+(2009-2010)
=-1-1-1-.........-1
=-1*2010/2
=-1005
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