问几个蓝皮书上的问题:
Q1.a number of people each wrote down one of the first 30 positive integers .wew any of the integers written down by more than one of the people ?
(1).the number of people who wrote down an integer was greater than 40
(2).the number of people who wrote down an integer was less than 70
答案选Ａ．可我觉得应该是Ｅ，原来来ＧＷＤ上见过解答，忘了．谢谢帮下忙．
Ｑ２．is x negative?
(1) n^3(1-x^2)<0 (2) x^2-1<0
答案是Ｃ，我觉得应该是Ｅ，大家觉得呢？
Ｑ３．in a certain coding scheme , each word is encded by replacing each letter in the word with another letter.the same code is used for all words ,so that the same letter replaces a given letter each time the given letter occurs . what code will result when the word TAME is encoded by this scheme?
(1) when the word MAT is encoded,the result is DLX
(2).When the word TEA is encoded, the result is XRL
答案选Ｃ，我觉得选Ｅ，不知道为什么．．．有点读不懂题
希望好心人帮忙／．．．．．．谢谢
1 a number of people each wrote down one of the first 30 positive integers
注意红色部分的含义。40个人写30个数字，当然会有的数字被超过一个人写了。
a is right
2
(1) n^3(1-x^2)<0 (2) x^2-1<0
x^2-1<0 所以 x^2<1
所以1-x^2〉0 而 n^3(1-x^2)<0
所以n^3<0 所以 n<0
c is right
3 题意大致是：现在有一组密码，每个字母对应着另一个字母。密码规则是不变的。问：在这样的密码规则下TAME 对应什么字母。
(1) when the word MAT is encoded,the result is DLX
(2).When the word TEA is encoded, the result is XRL
mat 对应 dlx m--d a--l t--x
tea 对应 xrl t--x e--r a--l
所以：tame 为 t--x a--l m--d e--r xldr
c is right.
楼主的阅读能力不行啊，建议加强哦。
非常感谢SOCIETY的解答,很详细哈,不过对于2的解答,它上面是问X是否为负数,所以还是选E哈....要是问N的话,那当然没错.谢谢你了.......
关于阅读能力..真在加强.....比登天还难
英语是弱项
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