Q13:
What is the value of the integer n?
(1) n(n + 2) = 15
(2) (n + 2)n = 125
The right answer is B but why not D?
From (1) we can get 1,3,5,15 are the facters of 15. But only when n=3, n(n+2)=15 is valid.
From (2) we can get 125 = 5^3, so n=3, (n+2)^n is valid.
假设
Q13: What is the value of the integer n? (没有提到是整数) (1) n(n + 2) = 15 (2) (n + 2)n = 125 那么结果还是B吗,除了3,还有别的数(不论整数分数)能够满足 (n + 2)n = 125 吗,
我认为没有了,不知大家有没有别的想法
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