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标题: GWD29-3 [打印本页]

作者: greates 时间: 2010-2-14 21:20 标题: GWD29-3

Q3:

If n is an integer and xⁿ – x^-n
= 0, what is the value of x ?
(1) x is an integer.

(2) n ≠ 0

Answer is E

I think it should be B

since, n ≠ 0 , so X must be 1

n ≠ 0 , so X must be 1

作者: dimder 时间: 2010-2-15 19:55

X=-1, 0, 1 皆可

作者: greates 时间: 2010-2-18 23:00

Thank you.

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