1/(5*8)+1/(8*11)+1/(11*14)+L+1/(98*101)
=(1/5-1/8+1/8-1/11+1/11-1/14+.+1/98-1/101)*1/3
=(1/5-1/101)*1/3
=32/505
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如果本题有什么不明白可以追问,
1/(5*8)+1/(8*11)+1/(11*14)+L+1/(98*101)
=(1/5-1/8+1/8-1/11+1/11-1/14+.+1/98-1/101)*1/3
=(1/5-1/101)*1/3
=32/505
土豆团邵文潮为您答疑解难.
如果本题有什么不明白可以追问,