(1-1/2)*(1+1/2)*(1-1/3)*(1+1/3)*(1-1/4)*(1+1/4)*.*(1-1/2000)*(1+1/2000)求在半个小时之内解答!

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(1-1/2)*(1+1/2)*(1-1/3)*(1+1/3)*(1-1/4)*(1+1/4)*.*(1-1/2000)*(1+1/2000)求在半个小时之内解答!
(1-1/2)*(1+1/2)*(1-1/3)*(1+1/3)*(1-1/4)*(1+1/4)*.*(1-1/2000)*(1+1/2000)
求在半个小时之内解答!

(1-1/2)*(1+1/2)*(1-1/3)*(1+1/3)*(1-1/4)*(1+1/4)*.*(1-1/2000)*(1+1/2000)求在半个小时之内解答!
=(1-1/2)(1+1/2)(1-1/3)(1+1/3)……*(1-1/2000)*(1+1/2000)
=(1/2)(3/2)(2/3)(4/3)……(1999/2000)*(2001/2000)
中间约分
=(1/2)(2001/2000)
=2001/4000
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(1-1/2)×(1+1/2)×(1-1/3)×(1+1/3)×(1-1/4)×(1+1/4)
=1/2×3/2×2/3×4/3×3/4×5/4
=1/2×(3/2×2/3)×(4/3×3/4)×5/4
=1/2×1×1×5/4
=5/8