1×1/2+1/2×1/3+1/3×1/4+.1/n×1/(n+1)怎么做RT
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![1×1/2+1/2×1/3+1/3×1/4+.1/n×1/(n+1)怎么做RT](/uploads/image/z/5276945-65-5.jpg?t=1%C3%971%2F2%2B1%2F2%C3%971%2F3%2B1%2F3%C3%971%2F4%2B.1%2Fn%C3%971%2F%28n%2B1%29%E6%80%8E%E4%B9%88%E5%81%9ART)
1×1/2+1/2×1/3+1/3×1/4+.1/n×1/(n+1)怎么做RT
1×1/2+1/2×1/3+1/3×1/4+.1/n×1/(n+1)怎么做
RT
1×1/2+1/2×1/3+1/3×1/4+.1/n×1/(n+1)怎么做RT
1×1/2+1/2×1/3+1/3×1/4+.1/n×1/(n+1)
=1-1/2+1/2-1/3+1/3-1/4+.1/n-1/(n+1)
=1-1/(n+1)
=n/(n+1)