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(1+1/2)(1+1/3)…(1+1/4)(1+1/2009)(1/2-1)(1/3-1)(1/4-1)…(1-1/2010)回答者追加奖赏!...
(1+1/2)(1+1/3)…(1+1/4)(1+1/2009)(1/2-1)(1/3-1)(1/4-1)…(1-1/2010)
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(1/2-1)(1/3-1)(1/4-1)…(1-1/2010)中是否是(1/2-1)(1/3-1)(1/4-1)…(1/2010-1),
因为 (1+1/2)(1+1/3)(1+1/4)…(1+1/2009)
=(3/2)(4/3)(5/4)…(2010/2009)=2010/2=1005,
(1/2-1)(1/3-1)(1/4-1)…(1/2010-1)
=(-1/2)(-2/3)(-3/4)…(-1999/2010)=(-1/2010),
(1+1/2)(1+1/3)…(1+1/4)(1+1/2009)(1/2-1)(1/3-1)(1/4-1)…(1/2010-1)
=1005 ×(-1/2010)=-1/2.
因为 (1+1/2)(1+1/3)(1+1/4)…(1+1/2009)
=(3/2)(4/3)(5/4)…(2010/2009)=2010/2=1005,
(1/2-1)(1/3-1)(1/4-1)…(1/2010-1)
=(-1/2)(-2/3)(-3/4)…(-1999/2010)=(-1/2010),
(1+1/2)(1+1/3)…(1+1/4)(1+1/2009)(1/2-1)(1/3-1)(1/4-1)…(1/2010-1)
=1005 ×(-1/2010)=-1/2.
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