(1-2分之1)*(1-3分之1)*(1-4分之1)*...*(1-1998分之1)*(1-1999分之1)
用简便计算 要完整的过程
人气:308 ℃ 时间:2020-02-06 06:15:50
解答
(1-2分之1)*(1-3分之1)*(1-4分之1)*...*(1-1998分之1)*(1-1999分之1)
=2分之1×3分之2×4分之3×……×1999分之1998
=1999分之1
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