简算:(1-1/11²)×(1-1/12²)×……×(1-1/99²)

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简算:(1-1/11²)×(1-1/12²)×……×(1-1/99²)
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简算:(1-1/11²)×(1-1/12²)×……×(1-1/99²)
简算:(1-1/11²)×(1-1/12²)×……×(1-1/99²)

简算:(1-1/11²)×(1-1/12²)×……×(1-1/99²)
(1-1/11²)×(1-1/12²)×……×(1-1/99²)
=(1+1/11)(1-1/11)×(1+1/12)(1-1/12)×……×(1+1/99)(1-1/99)
=(12/11)(10/11)×(13/12)(11/12)×(14/13)(12/13)……×(100/99)(98/99)
=(10/11)×(100/99)
=1000/1089

(1-1/11²)×(1-1/12²)×……×(1-1/99²)
=(1-1/121)x(1-1/144)x......(1-1/9801)
=(10x12)/(11²)x(11x13)/(12²)..........x(97x99)/(98²)x(98x100)/(99²)
=(10x11x12...

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(1-1/11²)×(1-1/12²)×……×(1-1/99²)
=(1-1/121)x(1-1/144)x......(1-1/9801)
=(10x12)/(11²)x(11x13)/(12²)..........x(97x99)/(98²)x(98x100)/(99²)
=(10x11x12²x13²x14².......x98²x99x100)/(11²x12²x13²x14².......98²x99²)
=(10x11x99x100)/(11²x99²)
=(10x100)/(99x11)
=1000/1089

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