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( 1+17/1)*(1+17/2)*(1+17/3)*.*(1+17/19)/(1+19/1)*(1+19/2)*(1+19/30*.*(1+19/17)=?
人气:484 ℃ 时间:2020-05-21 19:39:14
解答
原式 = [18/1 * 19/2 * 20/3 .* 36/19] / [20/1 * 21/2 * 22/3 ...* 36/17] =
[18/1 * 19/2 * 20/3 .* 36/19] * [1/20 * 2/21 * 3/22 *...* 17/36] =
36!/ 36!=
1
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