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PS:if k≠0,1 or -1,is 1/k>0? 1,1/(k-1)>0 2,1/(k+1)>0 答案A,为什么不是B?k-1不是小于k吗?分母小,整个就会大于1/k,怎么能推出1/k>0?
the function f is defined for all positive integers n by the following rule :f(n)is the number of positive integers each of which is less than n and has no positive factor in common with n other than 1 ,if p is any prime number then f(p)= p-1 p-2 (p+1)/2 (p-2)/2 2 答案a,这道题迷得不行啊,题都没怎么看完,怎么解啊?
PS:if it tllk Carios 1/2 hour to cycle from his house to the library yesterday ,was the distance that he cycled greater than 6 miles?(note: 1 mile =5280 feet) 1,the average speed at which Carios cycled from his house to the library yesterday was greater than 16 feet per second 2,the average speed at which Carios cycled from his house to the library yesterday was less than 18 feet per second 答案e,为什么不是b?b中不是可以算出cycle的长度小于540feet吗?果断证明问题不能实现,这不也是有效推理吗?还是我理解错了?
谢谢各位!多谢! |
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