(1-1/4)(1-1/9)(1-1/6)……(1-1/100)

如题所述

(1-1/4)(1-1/9)(1-1/16)……(1-1/100)
=(1-1/2²)(1-1/3²)(1-1/4²)……(1-1/10²)
=(1+1/2)(1-1/2)(1+1/3)(1-1/3)(1+1/4)(1-1/4)......(1+1/10)(1-1/10)
=3/2×1/2×4/3×2/3×5/4×3/4×......×11/10×9/10
=1/2×11/10
=11/20
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第1个回答  2013-04-10
(1-1/4)(1-1/9)(1-1/16)……(1-1/100)
=(1+1/2)(1-1/2)(1+1/3)(1-1/3)(1+1/4)(1-1/4)……(1+1/100)(1-1/100)
=3/2×4/3×5/4×……×101/100×1/2×2/3×3/4×……×99/100
=101/2×1/100
=101/200
第2个回答  2013-04-10
是1-1/6还是1-1/16啊