(1-2/1)3/1-1)(1-4/1)(5/1-1)…(2009/1-1)(1-2010/1)等于几?

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(1-2/1)3/1-1)(1-4/1)(5/1-1)…(2009/1-1)(1-2010/1)等于几?(1-2/1)3/1-1)(1-4/1)(5/1-1)…(2009/1-1)(1-2010/1)

(1-2/1)3/1-1)(1-4/1)(5/1-1)…(2009/1-1)(1-2010/1)等于几?
(1-2/1)3/1-1)(1-4/1)(5/1-1)…(2009/1-1)(1-2010/1)等于几?

(1-2/1)3/1-1)(1-4/1)(5/1-1)…(2009/1-1)(1-2010/1)等于几?
(1-2/1)(3/1-1)(1-4/1)(5/1-1)…(2009/1-1)(1-2010/1)
=1/2×(-2/3)×3/4×(-4/5)×……×(-2008/2009)×2009/2010
总共有2010-1=2009个数,则负数的个数为(2009-1)÷2=1004个,所以积是正数
= 1/2010

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