(1-2²分之一﹚﹙1-3²分之一﹚﹙1-4²分之一﹚…﹙1-10²分之一﹚
=(1-1/2)(1+1/2)((1-1/3)(1+1/3)···(1-1/10)(1+1/10)
=1/2×3/2×2/3×4/3×3/4×5/3×···×9/10×11/10
=1/2×11/10
=11/20
(1-2²分之一﹚﹙1-3²分之一﹚﹙1-4²分之一﹚…﹙1-10²分之一﹚
(1-2²分之一﹚﹙1-3²分之一﹚﹙1-4²分之一﹚…﹙1-10²分之一﹚
怎样用简便方法计算呢,
怎样用简便方法计算呢,
英语人气:393 ℃时间:2020-03-27 14:06:12
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