(1-1/2²)(1-1/3²)...(1-1/1999²)(1-1/2000²)
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![(1-1/2²)(1-1/3²)...(1-1/1999²)(1-1/2000²)](/uploads/image/z/7050308-68-8.jpg?t=%EF%BC%881-1%2F2%26%23178%3B%EF%BC%89%EF%BC%881-1%2F3%26%23178%3B%EF%BC%89...%EF%BC%881-1%2F1999%26%23178%3B%EF%BC%89%EF%BC%881-1%2F2000%26%23178%3B%EF%BC%89)
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(1-1/2²)(1-1/3²)...(1-1/1999²)(1-1/2000²)
(1-1/2²)(1-1/3²)...(1-1/1999²)(1-1/2000²)
(1-1/2²)(1-1/3²)...(1-1/1999²)(1-1/2000²)
原式=1/2*3/2*2/3*4/3*...*1999/2000*2001/2000
=1*2*...*1999 * 3*4*...*2001/(2*3*...2000)^2=1/2000*2001/2=1000.5+1/2000
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