Re: [計量] PP1-PS -7 AND 19
※ 引述《HsuanF (I miss...so much)》之銘言：
: 不好意思 要請各位幫忙看看以下兩題 @@
: 要麻煩各位高手了
: 7.For every positive even integer n, the function h(n) is defined to be the
: product of all the even integers from 2 to n, inclusive. If p is the
: smallest prime factor of h(100) + 1, then p is
對每個正整偶數n來說,這個方程式h(n)被定義為2到n裡面所有偶整數的乘積.
假設p是h(100)+1這個數的最小值因數 那p是多少?
h(100)+1=2*4*6*8*10*....*100+1 由此可知他的因數是1和本身 但是1不是質數
因此質因數一定會大於40 所以選(E)
: (A) between 2 and 10
: (B) between 10 and 20
: (C) between 20 and 30
: (D) between 30 and 40
: (E) greater than 40
: ANS:E
: 19.For a finite sequence of nonzero numbers, the number of variations in
: sign is defined as the number of pairs of consecutive terms of the sequence
: for which the product of the two consecutive terms is negative. What is the
: number of variations in sign for the sequence 1, -3, 2, 5, -4, -6 ?
對一個有限的非零數字的序列來講 the number of variations被定義為在這序列中一對
兩個連續的數字中 相乘的成績是負的有幾個 而題目問說請問1, -3, 2, 5, -4, -6有幾個
the number of variations
這題不用排序列 因為題目已經有寫the sequence 1, -3, 2, 5, -4, -6
就把兩個先連的數字相乘 看有幾個負數嚕 答案就是1*-3 -3*2 5*-4 三個 答案(C)
: (A) One
: (B) Two
: (C) Three
: (D) Four
: (E) Five
: ANS:C
: 想破頭也想不出WHY......>_<
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推
12/02 18:16, , 1F
12/02 18:16, 1F
→
12/02 18:18, , 2F
12/02 18:18, 2F
→
12/02 18:18, , 3F
12/02 18:18, 3F
→
12/02 18:21, , 4F
12/02 18:21, 4F
→
12/02 18:22, , 5F
12/02 18:22, 5F
→
12/02 18:22, , 6F
12/02 18:22, 6F
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