17. Is the positive integer n equal to the square of an integer?
(1) For every prime number p, if p is a divisor of n, then so is p2.
(2) is an integer.
Ans: B
I choose D
What does "then so is p2." mean?
18. What is the volume of a certain cube?
(1) The sum of the areas of the faces of the cube is 54.
(2) The greatest possible distance between two points on the cube is
Ans: D
I guess the answer maybe wrong.作者: tongxun 时间: 2003-1-17 01:34
17的关键在于then so is p2.是什么意思？作者: joywzy 时间: 2003-1-17 07:40 标题: cube是立方体，我明白了18题了
谢谢tongxun!
17题是什么意思？作者: lisaislisa 时间: 2003-1-17 08:25
17.(1) For every prime number p, if p is a divisor of n, then so is p2.
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means if p is a divisor of n ,then p^2 is the divisor of n too
it is insufficient , since P^2 is the divisor of N doen't mean that N=P^2
but I can not understand 2) , which is an integer?
anything missed ?
