1x2/1+2x3/1+3x4/1.2004x2005/1
2个回答
1x2/1+2x3/1+3x4/1.2004x2005/1
=1-2/1+2/1-3/1+3/1-4/1+……+2004/1-2005/1
=1-2005/1
=2005/2004
相关问题
1x1-2x2+3x3-4x4……-2004x2004+2005x2005
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1/1x2+1/2x3+1/3x4+L+1/2004x2005 怎么算?
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