x/1*2 +x/2*3 +x/3*4.+x/2007*2008 =(x-x/2)+(x/2-x/3)+(x/3-x/4)+……+(x/2007-x/2008)=x-x/2008=x2007/2008,
x/1*2 +x/2*3 +x/3*4.+x/2007*2008
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相关问题
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（1-2）x（2-3）x（3-4）x（4-5）x.x(2007-2008)x(2008-2009)
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2006x2007+2007x2008+2008x2006-2/1+2+3+4+5'''''''+2006+2007
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x/(1X2)+x/(2X3)+x/(3X4)+.+x/(2007X2008)
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1/1x2+1/2x3+1/3x4+.1/2007x2008
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已知S=1X2X3+2X3X4+3X4X5+……+2007X2008X2009,求出4XS/(2007X2008X200
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解方程,1×2/x+2×3/x+3×4/x+4+5/x+……+2007+2008/x=2007
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计算：1/1x2+1/2x3+1/3x4+……+1/2007x2008
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(-1x1/2)+(-1/2x1/3)+(-1/3x1/4)+.+(-1/2007x1/2008)+(-1/2008X1
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（-1x1/2）+(-1/2x1/3)+(-1/3x1/4)+.+(-1/2007x1/2008)+(-1/2008X1
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解方程：x/1*2+ x/2*3 +······+ x/2007*2008=2007