求1/1×2+1/2×3+.+1/2008×2009等于
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求1/1×2+1/2×3+.+1/2008×2009等于
求1/1×2+1/2×3+.+1/2008×2009等于
求1/1×2+1/2×3+.+1/2008×2009等于
1/1×2+1/2×3+.+1/2008×2009
=1-1/2+1/2-1/3+...+1/2008-1/2009
=1-1/2009
=2008/2009
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原式=1-1/2+1/2-1/3......+1/2008-1/2009
=1-1/2009
=2008/2009