1+3+5······+2005 等于多少 1-2+3-4+5-6+7-8+······+4999-5000 等于多少请写出计算过程

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1+3+5······+2005 等于多少 1-2+3-4+5-6+7-8+······+4999-5000 等于多少请写出计算过程
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1+3+5······+2005 等于多少 1-2+3-4+5-6+7-8+······+4999-5000 等于多少请写出计算过程
1+3+5······+2005 等于多少 1-2+3-4+5-6+7-8+······+4999-5000 等于多少
请写出计算过程

1+3+5······+2005 等于多少 1-2+3-4+5-6+7-8+······+4999-5000 等于多少请写出计算过程
1+3+5······+2005 =(1+2005)/2的平方=1003*1003=1006009
1-2+3-4+5-6+7-8+······+4999-5000 =(1-2)+(3-4)+··+(4999-5000)=-1*5000/2=-2500

1+3+5······+2005
=2006*1002+1003
=20110155
1-2+3-4+5-6+7-8+······+4999-5000
=-1*2500
=-2500