1/1x2+1/2x3+1/3x4+1/4x5+...+1/2009x2010
=1-1/2+1/2-1/3+1/3-1/4+1/4-1/5+...+1/2009-1/2010
=1-1/2010
=2009/2010
1/1x2+1/2x3+1/3x4+1/4x5+...+1/2009x2010
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相关问题
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1/1x2+1/2x3+1/3x4+.1/2009x2010
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计算:1/1x2+1/2X3+1/3x4+...+1/2009x2010
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求1\1X2+1\2X3+1\3X4+1\4X5.+1\2009X2010的值,请帮我解答,
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X/1*2+X/2*3+X/3*4+.+X/2009*2010=2009 X=?
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1/1x2+1/2x3+1/3x4+1/4x5+1/5x6+......1/2008x2009
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计算1/1x2+1/2x3+1/3x4+…+1/2009x2010的值,提示：1/1x2=1-1/2,1/2x3=1/2
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2010x/1+2 + 2010x/ 1+2+3 + 2010x/1+2+3+4 + 2010x/1+2+.2010=2
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1x2/1+2x3/1+3x4/1+…+2008x2009/1=?
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方程x/1x2+x/2x3+x/3x4+x/4x5+...+x/2009x2010=2009的解是?
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（1-2/1）x（1-3/1)x（1-4/1)x（1-5/1)x...x（1-2009/1)=