依题意得: 令t=1/2+1/3…+1/2004,则原试=(t+1/2005)*(1+t)-(1+t+1/2005)*t =t+t平方+1/2005+1/2005*t-t平方-2006/2005*t =1/2005
(1/2+1/3+...+1/2005)乘(1+1/2+...+1/2004)-(1+1/2+...+1/2005)(1
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相关问题
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(1-1/2005)+(1-1/2005×2)+(1-1/2005×3)+...+(1-1/2005×2004)+(1-
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1/2+1/(2*3)+1/(3*4)+.+1/(2004*2005)+1/(2005*2006)
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计算(2+1/2003+1/2004+1/2005)*(1/2003+1/2004+1/2005+1/2006)-(2+
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计算:(2+1/2003+1/2004+1/2005)*(1/2003+1/2004+1/2005+1/2006)-(2
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1+1/1.2+1/2.3.1/2003.2004+1/2005
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(1/2+1/3+1/4+.+1/2004)(1+1/2+.+1/2004)-(1+1/2+.+1/2005)(1/2+
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1+2+3...+2003+2004+2005+2006+2005+2004+2003+...3+2+1
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2005×(1×2/1+2×3/1+3×4/1+···+2003×2004/1+2004×2005/1)=?
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1+1/2+1/3+1/4+……+1/2004+1/2005=
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计算:2005×(1/1×2+1/2×3+1/3×4+…+1/2003×2004+1/2004×2005)