(1+2/5)x(1-2/5)x(1+2/7)x(1-2/7)x...x(1-5/2005)的得数
(1+2/5)×(1-2/5)×(1+2/7)×(1-2/7)×……×(1-2/2005)
=3/5×7/5×5/7×9/7×……×2003/2005×2007/2005
=3/5×2007/2005
=6021/10025
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(1+2/5)×(1-2/5)×(1+2/7)×(1-2/7)×……×(1-2/2005)
=3/5×7/5×5/7×9/7×……×2003/2005×2007/2005
=3/5×2007/2005
=6021/10025