如题所述
三分之一加三×五分之一加五×七分之一+……+99 乘以 101 分之 1
=1/2×(1-1/3+1/3-1/5+1/5-1/7+……+1/99-1/101)
=1/2×(1-1/101)
=1/2×100/101
=50/101
=1/2×(1-1/3+1/3-1/5+1/5-1/7+……+1/99-1/101)
=1/2×(1-1/101)
=1/2×100/101
=50/101
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第1个回答 2013-06-20
三分之一加三×五分之一加五×七分之一+……+99 乘以 101 分之 1
=1/2×(1-1/3+1/3-1/5+1/5-1/7+……+1/99-1/101)
=1/2×(1-1/101)
=1/2×100/101
=50/101
=1/2×(1-1/3+1/3-1/5+1/5-1/7+……+1/99-1/101)
=1/2×(1-1/101)
=1/2×100/101
=50/101