已知根号a-1+(ab-2)平方=0.求1/ab+1/(a+2)(b+2)+...+1/(a+2004)(b+2004)的值
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因为根号a-1≥0,(ab-2)平方≥0,它们的和等于零,所以a-1=0,ab-2=0
解得:a=1,b=2
那么1/ab+1/(a+2)(b+2)+1/(a+4)(b+4)+……+1/(a+2004)(b+2004)
=1/2+1/(3×4)+1/(5×6)+……+1/(2005×2006)
=(1-1/2)+(1/3-1/4)+(1/5-1/6)+……+(1/2005-1/2006)
=1+1/3+1/5+1/7+……+1/2005-1/2-1/4-1/6-……-1/2006
=
解得:a=1,b=2
那么1/ab+1/(a+2)(b+2)+1/(a+4)(b+4)+……+1/(a+2004)(b+2004)
=1/2+1/(3×4)+1/(5×6)+……+1/(2005×2006)
=(1-1/2)+(1/3-1/4)+(1/5-1/6)+……+(1/2005-1/2006)
=1+1/3+1/5+1/7+……+1/2005-1/2-1/4-1/6-……-1/2006
=
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