(1-2)(2-3)(3-4)(4-5)...(2008-2009)等于多少
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(1-2)(2-3)(3-4)(4-5)...(2008-2009)等于多少
(1-2)(2-3)(3-4)(4-5)...(2008-2009)等于多少
(1-2)(2-3)(3-4)(4-5)...(2008-2009)等于多少
1
因为是偶数个-1相乘