(1-1/2²)(1-1/3²)(1-1/4²)...(1-1/10²)快!给好评
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(1-1/2²)(1-1/3²)(1-1/4²)...(1-1/10²)快!给好评
(1-1/2²)(1-1/3²)(1-1/4²)...(1-1/10²)快!给好评
(1-1/2²)(1-1/3²)(1-1/4²)...(1-1/10²)快!给好评