標題:
1題CE 數.
發問:
1. If the product of the first n terms of the sequence 10,10^2,10^3,...,10^n exceeds 10^55, find the minimum value of n. A.9 B.10 C.11 D.12 E.56 更新: http://hk.knowledge.yahoo.com/question/question?qid=7011072400650 有興趣可以幫忙一下;)
最佳解答:
10 x 102 x 103 x ... x 10? > 10?? 10?1 ? 2 ? 3 ? "" ? ?? > 10?? 1 + 2 + 3 + ... + n > 55 n(n+1)/2 > 55 n2 + n - 110 > 0 (n - 10)(n + 11) > 0 n < - 11 (rejected) or n > 10 n(min.) = 11 (C)
其他解答:
1題CE 數.
發問:
1. If the product of the first n terms of the sequence 10,10^2,10^3,...,10^n exceeds 10^55, find the minimum value of n. A.9 B.10 C.11 D.12 E.56 更新: http://hk.knowledge.yahoo.com/question/question?qid=7011072400650 有興趣可以幫忙一下;)
最佳解答:
10 x 102 x 103 x ... x 10? > 10?? 10?1 ? 2 ? 3 ? "" ? ?? > 10?? 1 + 2 + 3 + ... + n > 55 n(n+1)/2 > 55 n2 + n - 110 > 0 (n - 10)(n + 11) > 0 n < - 11 (rejected) or n > 10 n(min.) = 11 (C)
其他解答:
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